The difference between a virus and a self-replicating program which is like a virus is that rather than creating copies of itself on only one system it propagate through computer network. What is the self replicating program called?

The difference between a virus and a self-replicating program which is

1.	The difference between a virus and a self-replicating program which is like a virus is that rather than creating copies of itself on only one system it propagate through computer network. What is the self replicating program called?
A.	Time Bomb
B.	Cracker
C.	Keylogger
D.	Worm
Answer» E.