With respect to a computer virus, which one of the following statements is true?

AIt is a physical impurity in the CPU that causes it to malfunction

BIt is a program that infects a computer and thereby sends unsolicited bulk email

CIt is a program that copies itself to infect a computer without the user's permission or knowledge ✓ Correct

DIt is an accumulation of dust on the hard disk causing it to malfunction

Correct answer: (C) It is a program that copies itself to infect a computer without the user's permission or knowledge

Explanation

A computer virus is a program that copies itself to infect a computer without the user's permission or knowledge.

It attaches to files or programs and spreads when those infected items are opened or shared.

A physical impurity in the CPU is a hardware defect, whereas a virus is malicious software.

A program that only sends unsolicited bulk email describes spam activity, not the self-copying nature of a virus.

Dust building up on a hard disk is a physical maintenance issue, not a piece of code.

Antivirus tools detect viruses by matching known signatures and by watching for suspicious behaviour.

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