_________ changes each time it is installed to avoid detection by antivirus software.

  • A. Polymorphic virus
  • B. Worm
  • C. Logic bomb
  • D. Trojan horse

Explanation

A polymorphic virus changes its code or appearance, often through encryption or mutation, to make signature-based antivirus detection more difficult. Worms spread independently, but do not specifically change form for this purpose.

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