Which of the following cannot be removed by Anti Virus Package?

Concept

An anti-virus (anti-malware) package detects and removes malicious code — viruses, worms, trojans, ransomware — by scanning the contents of files and memory against known malware signatures and suspicious behaviour. Its job is to clean infected files, not to filter unwanted email. Unsolicited bulk email is a separate problem handled by an anti-spam filter, which classifies messages by sender reputation, headers and content, not by malware signatures.

Application

Among the choices, three are file types and one is a category of email:

• Executable, document and portable-document files are ordinary files stored on a system. A virus can attach itself to any of them, and an anti-virus engine can scan each one and clean or quarantine the infection — so these are all things an anti-virus package can act on.

• Unsolicited bulk email is not malicious code embedded in a file; it is a message-delivery nuisance. An anti-virus engine has no concept of “wanted vs. unwanted mail” — that decision belongs to a spam filter — so it cannot remove it.

Result

The item that an anti-virus package cannot remove is unsolicited bulk email (spam), because spam is a mail-classification problem solved by anti-spam filters, while an anti-virus only cleans malware out of files.