Which of the following statements about malware are true?

1.A Trojan Horse is malware disguised as legitimate software.

2.A virus inserts itself into another program and runs and spreads when the program is opened.

3.A worm is similar to a virus except that it does not need a program in order to run; it spreads by itself.

A1 and 2 only

B1 and 3 only

C2 and 3 only

D1, 2 and 3 ✓ Correct

Correct answer: (D) 1, 2 and 3

Explanation

All three descriptions of malware are accurate, so every statement holds true.

A Trojan Horse disguises malicious code inside apparently legitimate software, as Statement 1 states.

A virus embeds itself in another program and executes and spreads when that program is opened, matching Statement 2.

A worm needs no host program and copies itself across systems, confirming Statement 3.

The key contrast is that a worm self-propagates while a virus rides along inside a host program.

Trojans typically do not self-replicate, instead tricking users into running them.

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