Correct option is D
A computer virus is a malicious program designed to replicate itself and spread from one computer to another, usually without the user’s consent or awareness. It attaches itself to legitimate files or programs and executes malicious actions such as corrupting data, deleting files, or slowing down system performance.
Important Key Points:
- A virus needs a host file or program to spread and execute.
- It can cause data loss, corruption, or system malfunction once activated.
- Viruses spread via infected files, removable drives, email attachments, or networks.
Knowledge Booster:
- Computer device: Incorrect — a virus is not hardware; it is software.
- Keylogger: A specific type of malware that records keystrokes, not a self-replicating virus.
- With permission or knowledge: Viruses operate without user awareness, unlike legitimate software installations.
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