A polymorphic virus
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modifies its program code each time it attaches itself to another program or file
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is a malicious-logic program that copies itself repeatedly in memory or on a disk drive until no memory or disk space remains
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is a malicious-logic program that hides within or looks like a legitimate program
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infects a program file, but still reports the size and creation date of the original-uninfected program
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none of these
Reveal answer
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A
Correct answer
Explanation
A polymorphic virus changes its code structure each time it infects a new file, making it difficult for antivirus software to detect through signature-based methods. The other options describe different types of malicious programs: B is a worm, C is a Trojan horse, and D describes a stealth virus technique.