What is the primary difference between a virus and a worm?

Question:What is the primary difference between a virus and a worm?

1.A worm has the ability to self-propagate from an infected user’s computer to other computers

2.A worm is usually written by a cracker: Script bunnies do not have the skills to develop a worm program

3.A virus is very harmful to the computers it infects : a worm is not a serious a problem

4.Anti-virus software is effective in fighting viruses but not worms


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