• (A) A worm has the ability to self-propagate from an infected user’s computer to other computers
• (B) A worm is usually written by a cracker : Script bunnies do not have the skills to develop worm program
• (C) A virus is very harmful to the computers it infects; a worm is not a serious a problem
• (D) Anti-virus software is effective in fighting viruses but not worms