When identifying malware, what is a key difference between a Worm and a Bot?

When identifying malware, what is a key difference between a Worm and a Bot?
A . A Worm gets instructions from an external control channel like an IRC server.
B . A Worm, unlike a Bot, is installed silently as an add-on to a legitimate program.
C . A Bot, unlike a Worm, is frequently spread through email attachments.
D . A Bot gets instructions from an external control channel like an IRC server.

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Answer: D