A worm, like a virus, is a type of malware that moves from computer to computer (most commonly through networks) and can cause malicious problems. Unlike virus, a worm can stand alone - it is a complete program on itself. It basically does not need to depend on other files before it unleashes its potentials. In other words, it could operate more or less independently of other files. Also, unlike virus, a worm may not cause a terrible harm to a network. It could just be something less serious as just consuming bandwidth.
B. Change the router's default administrative password
Explanation:
The best way to prevent any unauthorized use is to change the password to something more secure using 12 minimum characters and including number, symbols, upper and lower case.
