Hackers usually use computer viruses for various malicious purposes, including logging user activity, corrupting data, and gaining access to sensitive information.

Here are the answers to the questions:

15) Hackers usually use computer viruses for various malicious purposes, including logging user activity, corrupting data, and gaining access to sensitive information.

• D. All of the above

16) An algorithm represented in the form of a programming language is called a program. Pseudocode is a high-level description, and a flowchart is a graphical representation.

• C. Program

17) Trojans (Trojan horses) are a type of malware that do not self-replicate. They rely on users to execute them, often by disguising themselves as legitimate software. Viruses and worms are known for their self-replication capabilities.

• A. Trojans

18) McAfee, AVG, and Norton are all well-known antivirus software brands. "Bracket" is not a type of antivirus software.

• D. Bracket

19) Flowcharts and algorithms are essential tools in software development. They help in structuring code for better programming, simplify the process of testing and debugging by providing a clear logical flow, and contribute to efficient coding by planning the solution before implementation.

• D. All of the above

20) Integrated Development Environments (IDEs) offer many advantages, such as faster setup due to integrated tools and configurations, and standardization of the development environment. While IDEs can facilitate learning through features like auto-completion and debugging, "continual learning" itself is a process undertaken by the developer, not a direct advantage provided by the IDE's features in the same way as the other options.

• B. Continual learning

21) The primary aim of cyber security is to protect computer systems and networks from digital attacks, thereby reducing the risk of cyber-attacks. Antivirus software is a component of cybersecurity. Notepad and NetBeans are software applications.

• A. Cyber security

22) A set of statements executed based upon a conditional test (e.g., an if statement) is known as selective execution or a conditional control structure. Looping involves repetition, and sequence involves executing statements in order.

• B. Selective

23) Information security is the practice of defending information from unauthorized access, use, disclosure, disruption, modification, or destruction. Computer viruses, worms, and spyware are types of threats, not the practice of defense.

• B. Information security