Which type of malware is able to propagate itself without user interaction?

Which type of malware is able to propagate itself without user interaction?

A.
Rootkit

B.
Trojan

C.
Virus

D.
Worm

Explanation:
Answer D is correct; the distinguishing feature of a worm is its ability to spread without user interaction. This capability has resulted in worms being able to rapidly infect millions of systems in a short period of time.

Incorrect Answers and Explanations: A, B, and C: Answers A, B, and C are incorrect. The main distinguishing feature of a rootkit is its ability to hide itself from a system administrator. A Trojan horse is malware that masquerades as something a user might want. A virus attaches to an executable and requires user interaction for spreading.