The worm at the bottom of your OS

What makes a computer worm significantly different than other types of malicious software?

A) The worm infects by pretending to be something benign

B) A worm is able to infect and spread without any user interaction

C) A worm communicates over encrypted channels

D) A worm can only infect a single machine

E) In an ironic twist, the worm jumps out of the bottle and eats your computer