Explanation- The full name of VIRUS is 'Vital Information Resources Under Siege'. A virus is a computer program that makes copies of itself and moves from one computer to another without your knowledge. It is a small illegal program and electronic code that destroys the information on a computer. All viruses are created by programs. Viruses increase/decrease the word length of software, making the processor unable to function.

Boot sector viruses are stored in the boot sector of the hard disk. When the computer is started, they hinder the operating system from loading, and if the operating system starts working, they disrupt other components of the computer.

A firewall is primarily used to protect a network from unauthorized access and threats.

C-Brain - Asad and Basit, Pakistani brothers, developed this virus in January 1986. Its purpose was to discourage people from illegally purchasing software. It is considered to be the world's first virus. It was a boot sector virus.

Antivirus is a software designed for smartphones and computers. The main function of an antivirus is to search for viruses, delete them, and prevent them from entering the computer.

Boot Sector Virus - These types of viruses are stored in the boot sector of floppy disks and hard disks. When the computer starts, they interfere with the loading of the operating system, and if the operating system somehow starts working, they begin to disrupt other components of the computer.

Firewall can be a combination of hardware and software. It is an important component of network security.

Keylogger is a computer program/software that records and saves all activity happening on a Personal Computer. If a keylogger is installed on your computer, it records all your activities such as Internet search, documents, keystrokes, mail, URL, passwords, ID, etc.

Firewall is used to maintain network security, primarily to prevent unauthorized access from external networks (like the internet).

A firewall is a part of a computer system or network designed to prevent unauthorized use and allow authorized communication. It is a device or set of devices configured to permit, deny, encrypt, decrypt, or perform a combination of both for computer traffic between security domains.

Passwords and User IDs should be confidential. Sharing them with anyone is dangerous for security.

See explanation of previous question. Virus is a malicious software. Other options are incorrect because virus slows down computer speed, the internet can be a medium for spreading viruses, and a virus is not an operating system.

Firewall primarily works to check authenticity to ensure that the data entering the network is valid.

Passwords are used for the basic level of security in computer systems. Without the password, a user-protected file cannot be opened.

Norton is not a virus that infects a computer but is an anti-virus program created for security.

The information in the question may be erroneous, typically the 'Welcome to the Lehigh' message is associated with the Lehigh virus, but according to the given options, many versions of the Brain virus were prevalent.

Proxy firewall is a type of network security system that works at the application layer and filters messaging to protect network resources.

Proxy makes tampering with the internal system from an external network difficult and does not corrupt security rules due to misuse of an internal system, as long as the application proxy remains intact and properly configured. Conversely, recovery systems hijack a public-log system to use it as a proxy for their own purposes, and the proxy still appears to such internal machines.

Illegally downloading movies, software, or other copyrighted material from the internet is called 'Piracy'.

Gaining unauthorized access to computer and network resources is called 'Hacking'.