An optical mark recognition system, also known as OMR, is a type of input device that uses light sensors to detect marks made on a special type of paper. It is commonly used to grade multiple-choice and true/false tests.
The OMR system works by shining a light on the paper and measuring the reflection that bounces back. The system can detect marks made by pencils, pens, or other writing instruments, as long as they are dark enough to reflect a significant amount of light.
OMR systems are used in a variety of industries, including education, healthcare, and market research. They are particularly useful in situations where large numbers of forms need to be processed quickly and accurately, such as standardized tests or surveys.
In summary, an OMR system is an input device that uses light sensors to detect marks made on a special type of paper. It is commonly used to grade multiple-choice and true/false tests and is widely used in industries that require the processing of large numbers of forms quickly and accurately.
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given that an ipv4 address is a 32-bit binary number represented in four octets
An IPv4 address is a 32-bit binary number represented in four octets, which means that there are 2^32 possible IP addresses. This is a large number, but not all of the possible addresses are usable because some are reserved for special purposes such as private networks, loopback addresses, and multicast addresses.
Each octet of an IPv4 address is represented as an 8-bit binary number, which can have a value between 0 and 255. For example, the IP address 192.168.1.1 is represented as the binary number 11000000.10101000.00000001.00000001. The purpose of dividing the IP address into four octets is to make it easier for humans to read and remember. This is why IP addresses are often written in decimal notation with periods separating the octets.
The use of IPv4 addresses is limited due to the increasing demand for internet-connected devices. Therefore, IPv6 was introduced, which uses 128-bit addresses and provides more than enough addresses to meet the demand. However, IPv4 is still widely used and will continue to be for the foreseeable future.
In conclusion, an IPv4 address is a 32-bit binary number represented in four octets, which allows for over 4 billion possible addresses. Each octet is represented as an 8-bit binary number, and the purpose of dividing the IP address into octets is to make it easier for humans to read and remember.
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which process involves developing a working replica of the system or some aspect of the system?
The process that involves developing a working replica of the system or some aspect of the system is called prototyping.
Prototyping is an important process in software development because it allows developers to test the system before investing too much time and money into building the final version. By creating a prototype, developers can identify and fix any problems or issues early on, which can save time and money in the long run.
Prototyping is a technique used in system development where a preliminary model or replica of the system is created to test and validate the design, functionality, and feasibility of the project. This helps developers to identify potential issues, gather feedback, and make improvements before finalizing the system.
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Which of the following is NOT an advantage of external hard drives over internal hard drives? Group of answer choices a. They can add storage space to a mobile computer. b. They leave data in the computer. c. They can transport a large number of files. d. They can easily store large audio and video files.
The correct answer is option b, "They leave data in the computer."
External hard drives offer several advantages over internal hard drives, such as portability, increased storage capacity, and ease of use. However, leaving data in the computer is not an advantage of external hard drives. In fact, external hard drives are designed to store data externally, away from the computer's internal storage, which helps free up space and improve the computer's performance.
External hard drives are a popular choice for users who need to store large amounts of data, such as documents, photos, music, and videos. They are available in various sizes and capacities, ranging from small and portable drives to large and high-capacity models. Here are some advantages of external hard drives over internal hard drives:
1. Portability: External hard drives are portable and can be easily carried around, making them ideal for users who need to access their data on the go.
2. Increased storage capacity: External hard drives offer greater storage capacity than most internal hard drives, which means users can store more data on a single device.
3. Ease of use: External hard drives are easy to set up and use, and can be connected to a computer via a USB cable or wireless connection.
4. Backup and data recovery: External hard drives can be used to create backups of important data, and can also be used for data recovery in case of a system failure or data loss.
5. Large audio and video files: External hard drives are ideal for storing large audio and video files, such as movies and music, which can take up a lot of space on a computer's internal hard drive.
In conclusion, while external hard drives offer several advantages over internal hard drives, leaving data in the computer is not one of them. External hard drives are designed to store data externally, away from the computer's internal storage, which helps free up space and improve the computer's performance.
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when downloading a new app, which criterion should you look for to keep your mobile device secure?
Answer:
An app that is actively updated and maintained by the developer.
When downloading a new app, there are several criteria you should look for to keep your mobile device secure, including:
Source: Make sure to download apps only from trusted sources such as official app stores (Ggle Play Store or Apple App Store) or reputable third-party app stores. Avoid downloading apps from unknown or untrusted sources, as these may contain malware or other security risks.
Reviews: Check the app's reviews and ratings before downloading it to see what other users have experienced with the app. Look for apps with a high number of positive reviews and ratings, and be cautious of apps with low ratings or negative reviews.
Permissions: Be aware of the permissions an app requests when you install it. Make sure the app only requests the permissions it needs to function properly, and avoid granting unnecessary permissions that could potentially compromise your device's security or privacy.
Updates: Keep your apps up to date by regularly checking for updates and installing them as soon as they become available. Updates often contain security fixes and other improvements that can help keep your device secure.
Developer: Check the developer's website and look for information about their history, reputation, and other apps they have developed. Reputable developers are more likely to produce secure and reliable apps.
Overall, being mindful of these criteria can help you make informed decisions when downloading new apps and help keep your mobile device secure.
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the crucial difference between a laser and an led printer is in the _____ device.
the crucial difference between a laser and an led printer is in the photoconductive device.
The crucial difference between a laser and an LED printer is in the imaging device they use. A laser printer uses a laser beam to create an electrostatic image of the page on a photoconductive drum, which is then developed with toner and transferred to paper. On the other hand, an LED printer uses an array of light-emitting diodes (LEDs) to directly expose the photoconductive drum, which is then developed and transferred to paper in the same way as a laser printer. LED printers tend to be smaller and less expensive than laser printers, but they may not achieve the same level of print quality or speed as their laser counterparts.
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What type of wireless network is very small and designed for "quick-and-dirty" jobs?
A)PAN
B)WAN
C)LAN
D)MAN
The type of wireless network that is very small and designed for "quick-and-dirty" jobs is a PAN, which stands for Personal Area Network.
A PAN is a wireless network that is typically used for connecting devices in close proximity to one another, such as within a room or a small area. PANs are often used for quick and easy data transfers between devices, such as between a smartphone and a laptop, or between a computer and a printer.
PANs can use a variety of wireless technologies, including Bluetooth and Wi-Fi, and are often used in home automation systems, wearable devices, and other applications where devices need to communicate with one another in a limited area. PANs are also commonly used in industrial settings for machine-to-machine communication and control.
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A class named SaleItem which has methods to calculate its own price is said to have good ______.A) coupling
B) object responsibility
C) API
D) cohesion
A class named SaleItem which has methods to calculate its own price is said to have good cohesion.
The given question asks about a class named SaleItem and its characteristics. The statement "which has methods to calculate its own price" suggests that the class has a specific responsibility or purpose. This purpose is an important aspect of good software design, known as cohesion. Cohesion refers to the degree to which the elements within a module or class are related to one another and work together to achieve a common purpose.
Therefore, the correct answer to the question is D) cohesion, as it describes the characteristic of the SaleItem class having methods that are closely related to its purpose of calculating its own price.
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the ____ operation is performed by the subtract command in relational algebra.
The operation performed by the subtract command in relational algebra is called "set difference" or "set subtraction."
What is the set operationIn relational algebra, the subtract operation is used to retrieve tuples from one relation that do not exist in another relation. It returns all the tuples from the first relation that are not present in the second relation, based on a specified condition or attribute comparison.
The subtract operation is denoted by the symbol "-" or the keyword "MINUS" in some variations of relational algebra. It is similar to the set difference operation in set theory, where it finds the elements that belong to one set but not another.
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a network administrator can join a computer to a domain using what powershell cmdlet?
The PowerShell cmdlet used to join a computer to a domain is "Add-Computer".
The "Add-Computer" cmdlet is used to add a computer to a domain or workgroup. To join a computer to a domain using PowerShell, you need to use the "-DomainName" parameter to specify the name of the domain and the "-Credential" parameter to specify the credentials of an account that has permission to join the computer to the domain. Here's an example:
Add-Computer -DomainName "example.com" -Credential "example\Administrator"
In this example, the "Add-Computer" cmdlet is used to join the local computer to the "example.com" domain using the credentials of the "Administrator" account in the "example" domain. After running this cmdlet, the computer will be joined to the domain and will need to be restarted for the changes to take effect.
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which industry group came up with a non-atx standard motherboard and power supply called eps12 v?
The EPS12V (Extended Power Supply) standard was developed by the Server System Infrastructure (SSI) Forum, an industry group consisting of major server and computer hardware manufacturers such as Intel, Dell, Hewlett Packard, and IBM.
The EPS12V standard is designed specifically for server and workstation systems, and it provides higher power delivery and more stable voltages than the standard ATX power supply. The EPS12V standard is also designed to accommodate multiple processors, high-end graphics cards, and other power-hungry components commonly found in server and workstation systems. While the EPS12V standard is not commonly used in consumer desktop systems, it is widely used in enterprise-level data centers and server farms.
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refereed/peer-reviewed journals that are only published in electronic format are referred to as
Refereed/peer-reviewed journals that are only published in electronic format are referred to as electronic peer-reviewed journals. These journals undergo the same rigorous peer-review process as traditional print journals, but are only accessible online.
This format allows for faster publication and wider distribution of research articles. Additionally, electronic peer-reviewed journals often have enhanced features such as multimedia components, interactive figures, and links to related content. However, it is important to note that not all electronic journals undergo the same level of peer-review, so it is important to verify the credibility and reputation of the journal before citing or relying on its content.
Refereed or peer-reviewed journals that are only published in electronic format are referred to as e-journals or electronic journals. These journals follow the same rigorous review process as traditional print journals, ensuring the credibility and quality of the published research. The primary difference is that e-journals are published and accessed online, providing easier access and often faster publication times.
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when imitation is continuous, with one voice always following after another, this is known as:
When imitation is continuous, with one voice always following after another, this is known as a canon.
A canon is a type of composition where a melody is repeated by different voices or instruments, but each voice or instrument starts the melody at a different time. This creates an overlapping effect, where one voice or instrument is always following after another in a repeating pattern. Canons can be found in various musical styles, including classical music, folk music, and even pop music. They are often used as a way to add complexity and depth to a musical composition, and they can also be used as a teaching tool for music students to develop their skills in harmony and counterpoint.
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when selecting a punch down block, what block type is more suitable for data connections?
When selecting a punch down block for data connections, the more suitable block type would be a 110 punch down block. The 110 punch down block is designed specifically for data transmission and provides better performance compared to older block types like the 66 block, which is more suitable for voice connections.
A 110 punch down block is a Category 5 (Cat 5) or Category 6 (Cat 6) block. These blocks are specifically designed for use with twisted pair cabling used in Ethernet networks.
Cat 5 or Cat 6 block allow for easy termination of wires without the need for stripping. The Cat 5 and Cat 6 blocks have been tested and certified to meet specific standards for performance, so they ensure reliable data transmission. It is important to choose a block that is compatible with the cable and connectors being used to ensure optimal performance.
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The most common and flexible data-acquisition method is ____.
A) Disk-to-disk copy
B) Disk-to-network copy
C) Disk-to-image file copy
D) Sparse data copy
None of the options provided in the question accurately describes the most common and flexible data-acquisition method.
The most common and flexible data-acquisition method is typically considered to be data logging, which involves the collection and storage of data from various sources, such as sensors or instruments, over a period of time.
This data can then be analyzed and used for various purposes, such as monitoring system performance or identifying trends and patterns. Data logging can be done using a variety of methods and technologies, such as standalone data loggers, computer-based data acquisition systems, or cloud-based platforms.
The method used depends on the specific application and requirements of the data acquisition project.
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The various forms of documentation that programmers insert into the program codes are _________________ or ___________________
The various forms of documentation that programmers insert into program codes are comments or annotations.
Comments and annotations are important elements of code documentation that provide additional information about the code to improve its understandability, maintainability, and collaboration among developers. They are non-executable statements or notations that are ignored by the compiler or interpreter. Comments are typically used to explain the purpose, functionality, or logic of a particular section of code. They can be single-line comments that start with double slashes (//) in languages like C++, Java, or JavaScript, or multi-line comments enclosed within /* */ in languages like C or Python. Annotations, on the other hand, are metadata added to the code to provide additional information or instructions for tools, frameworks, or libraries. They are often used in languages such as Java, Python, or C# to convey specific information to the compiler or runtime environment, enabling features like reflection, code analysis, or code generation. Both comments and annotations serve as documentation within the code, helping programmers and other stakeholders understand the code's purpose, functionality, usage, and potential limitations. They play a crucial role in enhancing code readability, facilitating maintenance and debugging, and promoting effective collaboration among developers.
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the way that images appear to be moving in films and videos is actually an optical illusion. true or false
True. The way that images appear to be moving in films and videos is actually an optical illusion. This illusion is created by displaying a series of still images at a rapid rate, typically 24 frames per second.
Each frame is slightly different from the one before it, and our brains interpret this rapid succession of images as continuous motion. This phenomenon is known as persistence of vision. The illusion of motion is further enhanced by the use of techniques such as camera movement, editing, and special effects. So while we may perceive movement in films and videos, it is actually our brains filling in the gaps between still images to create the illusion of motion.
This phenomenon is known as the Persistence of Vision. It occurs because our eyes and brain retain an image for a brief moment after it has disappeared, creating the illusion of continuous motion when a series of still images is presented rapidly.
In films and videos, individual frames are displayed in quick succession (usually 24, 30, or 60 frames per second), giving the appearance of smooth, continuous motion.
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Users interact via avatars in a(n) ____.a. public cloud
b. telepresence system
c. virtual world
d. RFID system
c. virtual world
The results show that users interacting with highly expressive avatars felt more social presence and attraction
Users interact via avatars in a c. virtual world as they converse, interact and communicate with each other.
How is this done?Through digital representations of themselves known as avatars, users in a digital world are able to communicate with each other. An environment created by a computer that can be explored by several users simultaneously is known as a virtual world. It serves as a space for socializing, gaming, and an array of other pursuits.
Individuals have the ability to design and personalize their virtual representations known as avatars. They have the ability to maneuver through the digital realm, engage with virtual objects and characters, communicate via written or vocal dialogue, and take part in a variety of virtual activities and gatherings.
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the report layout tools tabs are ____ tabs available only when working with report objects.
The Report Layout Tools tabs are a set of contextual tabs that are available only when working with report objects in Microsoft Access. These tabs provide a range of tools and options that are specific to working with reports, allowing users to customize the layout and design of their reports in a variety of ways.
There are four main Report Layout Tools tabs available in Access: Design, Format, Page Setup, and Arrange. The Design tab provides tools for adding and modifying report objects, such as fields, labels, and images. The Format tab allows users to apply formatting styles to individual report objects, such as fonts, colors, and borders. The Page Setup tab provides options for setting the size, orientation, and margins of the report page. Finally, the Arrange tab provides tools for aligning and positioning report objects on the page.Overall, the Report Layout Tools tabs are an essential set of tools for anyone working with reports in Access. By providing a range of options for customizing the layout and design of reports, these tabs make it easy to create professional-looking reports that are tailored to the needs of the user.
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The DTE or endpoint device for a leased line is known as which device below? A) CSU/DSU B) cable modem C) DSL modem D) ISDN modem.
Option A) CSU/DSU. The DTE (Data Terminal Equipment) or endpoint device for a leased line is typically known as a CSU/DSU (Channel Service Unit/Data Service Unit).
A CSU/DSU is a specialized piece of equipment that connects a digital circuit to a customer's data terminal equipment. It is typically used in leased line applications to interface customer premises equipment (CPE) with the service provider's digital circuit.
The CSU/DSU is responsible for converting the digital data from the customer's equipment into a format that can be transmitted over the leased line, and vice versa. It also provides error detection and correction, as well as line conditioning and testing functions.
Therefore, option A) CSU/DSU is the correct answer to the question.
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Consider a voice channel being used, via modem, to transmit digital data. Assume a bandwidth of 6100 Hz. What is the Nyquist capacity, C, of the channel for binary signal and for M=16?
The Nyquist capacity for a binary signal is 12200 bps, and for a signal with 16 levels (M=16), it is 48800 bps.
The Nyquist capacity formula for a voice channel is given by:
C = 2 * B * log2(M)
where B is the bandwidth and M is the number of signal levels.
For a binary signal (M=2), the Nyquist capacity would be:
C = 2 * 6100 * log2(2) = 2 * 6100 * 1 = 12200 bps
For M=16, the number of signal levels is 2^4, so the Nyquist capacity would be:
C = 2 * 6100 * log2(16) = 2 * 6100 * 4 = 48800 bps
Therefore, the Nyquist capacity for the binary signal is 12200 bps and for M=16 is 48800 bps.
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True/False - All the classes in the Design Class Diagram are used to define the database tables.
T/F; when joining two tables using sql, the convention is to use notation for field names.
True. When joining two tables using SQL, it is convention to use notation for field names, also known as aliases, to avoid ambiguity and make the SQL code easier to read and understand.
Aliases are temporary names assigned to fields in a table, and they are used in SQL statements to refer to a field by a different name. For example, if you have two tables that both have a field called "name", you can assign an alias to one of the fields to differentiate between them.The syntax for assigning an alias in SQL is "table_name.field_name AS alias_name". The "AS" keyword is optional and can be omitted, but it is often included for readability.
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very large peer-to-peer networks have emerged to take advantage of the internet.a. trueb. false
The answer is true. With the increasing popularity of the internet, very large peer-to-peer networks have indeed emerged.
These networks allow individuals to share and exchange data, files, and information without relying on a central server or authority. This decentralized approach to networking has led to the creation of various platforms such as BitTorrent, Gnutella, and eDonkey, among others. These networks have proven to be highly effective for sharing large files, such as videos, music, and software, among a large number of users. However, the use of peer-to-peer networks has also raised concerns regarding copyright infringement, security, and privacy. Nonetheless, these networks have become an integral part of the modern internet landscape and are likely to continue to evolve and grow in the future.
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the part inside a networked device that attaches the device to the network is called a
The part inside a networked device that attaches the device to the network is called a network interface or network interface card (NIC). It is a hardware component that connects a computer or other networked device to a network.
The NIC provides the physical connection to the network media, such as a wired Ethernet cable or wireless radio waves. It also provides the necessary electronics to convert data between the digital signals used by the computer and the analog signals used by the network.
The NIC typically has a unique identifier, known as a MAC address, which is used to identify the device on the network. Most modern computers and devices come with built-in NICs, but they can also be added to a system using an expansion slot or a USB port.
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The ____ format enables users easily to share documents with others. A)PDF B)DOCM C)TFT D)XLS.
A) PDF. The PDF format enables users easily to share documents with others.
PDF (Portable Document Format) enables users to easily share documents with others, regardless of the operating system, software or hardware used to create the document. PDF files preserve the formatting, fonts, images, and other elements of the original document, making them easy to view and print, while also allowing for secure digital distribution. PDFs can be opened and viewed on a wide range of devices, including smartphones, tablets, laptops, and desktops, and can be shared via email, cloud storage, or other file-sharing platforms. The PDF format is widely used for documents such as manuals, contracts, invoices, reports, and more, and is an essential tool for businesses, educational institutions, and individuals alike.
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By exporting the Windows Firewall policy, you have a file with a .wfw extension that contains: a. The rules and settings for the firewall b. The log of all firewall activity c. A backup of the entire operating system d. The network topology diagram
By exporting the Windows Firewall policy allows you to obtain a file with the rules and settings for the firewall(option a).
By exporting the Windows Firewall policy, you can obtain a file with a .wfw extension that contains the rules and settings for the firewall. This file can be used to easily transfer the firewall policy to another computer, or to restore the policy on the same computer after a reinstall.
It's important to note that the file does not contain the log of all firewall activity, a backup of the entire operating system, or the network topology diagram. These are separate components that are not included in the .wfw file.
The firewall log is a separate file that can be accessed through the Windows Event Viewer, while a backup of the entire operating system is typically created using backup software or tools provided by the operating system. The network topology diagram is a visual representation of the network and is not related to the firewall policy.
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which keywords are used to complete the deletion of a column previously marked with set unused?
In Oracle, the keywords used to complete the deletion of a column previously marked with SET UNUSED are DROP and COLUMNS. After a column is marked as unused, it is no longer visible to the users or applications, but it still occupies space in the database. To permanently remove the unused column and reclaim the space, the DROP COLUMNS command is used. The syntax for this command is as follows:
ALTER TABLE table_name
DROP UNUSED COLUMNS;This will permanently remove all columns that have been marked as unused in the specified table. It is important to note that once the columns are dropped, any data stored in them will be permanently lost, so it is recommended to backup the database before executing this command.
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user profiles should enable the network manager to identify the access rights (to particular files and directories) for each user. question 4 options: true false
The statement "User profiles should enable the network manager to identify the access rights (to particular files and directories) for each user" is true.
User profiles are an important aspect of access control in computer systems and networks. A user profile is a collection of settings and permissions that are associated with a particular user account. One of the key components of a user profile is access control, which specifies the access rights that the user has to particular files and directories on the system.
By maintaining user profiles that include access control settings, network managers can easily manage user permissions and ensure that users have access to only the resources they need. This helps to prevent unauthorized access and data breaches, and also enables network managers to easily revoke access when a user no longer needs it.
Overall, user profiles are an important tool for managing access control in computer systems and networks, and can help network managers to ensure that users have the appropriate level of access to resources on the network.
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why would a user need to use the gpresult command? to change from the current working folder to another folder to verify the settings that are suspected to be incorrect to create a new windows directory to make the pc synchronize with new group policy settings
The GPResult command is a command-line tool in Windows that can be used to view the Resultant Set of Policy (RSoP) information for a user and computer.
It is used to view the details of group policy settings that have been applied to the user and computer from both local and Active Directory-based group policies. It can be used to diagnose group policy application issues, verify that the correct policies are being applied and identify any conflicting policies. Additionally, it can be used to compare settings of multiple computers or users to determine how settings are applied, and to audit configurations to ensure that they are in line with company policies. GPResult helps to ensure that all users are affected by the same policies, and allows IT administrators to quickly troubleshoot and remediate any policy-related issues.
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In data encryption, the https in a browser address bar indicates a safe HTTP connection over _____.
a. Transport Layer Security
b. User Datagram Protocol
c. Transmission Control Protocol
d. Secure Sockets Layer
When you see HTTPS in a browser address bar, it indicates a safe HTTP connection over Secure Sockets Layer (SSL).
The use of data encryption has become increasingly important in our modern digital world to ensure the security and privacy of sensitive information. When accessing a website, the browser address bar often displays "http" or "https" at the beginning of the URL. The "https" indicates that the website is using a secure HTTP connection, which encrypts any data being transmitted between the user's device and the website's server. This encryption helps to prevent unauthorized access or interception of sensitive information.
The "https" in a browser address bar indicates a safe HTTP connection over the Secure Sockets Layer (SSL) or Transport Layer Security (TLS) protocols. Option D, Secure Sockets Layer, is the correct answer to the question.
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