A worm is

Question:
A worm is...

1. a collection of malicious programs that secretly provides continued, privileged access to a system for an unauthorized user
2. code downloaded without a user’s authorization which is then used to steal sensitive information and relay it to an outside party in a way that harms the original user
3. a malicious self-replacing application that attaches itself to other programs and executables without the permission of the user
4. self-replicating code that copies itself from computer to computer without user intervention

Answer:
D - is the correct answer