Your manager has asked you about the essential difference between worms and viruses. Which of
the following is true?

A.
A virus is self-replicating, whereas a worm requires some sort of user action.

B.
A virus can work only on Windows systems, whereas a worm can work on any common
platform (e.g., Macintosh, UNIX, Windows).

C.
A worm can work only on Windows systems, whereas a virus can work on any common
platform (e.g., Macintosh, UNIX, Windows).

D.
A worm is self-replicating, whereas a virus requires some sort of user action.