What is the main difference between a virus and a worm?
a. A virus can do more damage than a worm.
b. Worms work only in background mode.
c. A virus is a standalone program, whereas a worm requires a host program to infect.
d. A virus requires a host program to infect, whereas a worm is a standalone program.
Answer: d. A virus requires a host program to infect, whereas a worm is a standalone program.