What is the difference between a virus and a worm?

Select one:

A$.$ A virus is a self$-$contained program that replicates and sends copies of itself to other computers across a network. A worm is a program that attaches itself to or copies itself into another program.

B$.$ A virus is malware that modifies or replaces one or more existing programs to hide the fact that a computer has been compromised. A worm is a program that either hides or masquerades as a useful or benign program.

C$.$ A virus is a program that either hides or masquerades as a useful or benign program. A worm is malware that modifies or replaces one or more existing programs to hide the fact that a computer has been compromised.

D$.$ A virus is a program that attaches itself to or copies itself into another program. A worm is a self$-$contained program that replicates and sends copies of itself to other computers across a network.