What are worms?

What are worms?
A . A type of malware that compromises a system and then often demands a ransom from the victim to pay the attacker in order for the malicious activity to cease or for the malware to be removed from the affected system.
B . Viruses that replicate themselves over the network, infecting numerous vulnerable systems. On most occasions, a worm will execute malicious instructions on a remote system without user interaction.
C . An exploit of a network infrastructure device vulnerability that installs a backdoor on the affected system.
D . An exploit of a firewall vulnerability that installs a backdoor on the affected system.

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Answer: B