Which of the Following Is a Remote Software Attack from Outside

Which of the following is a remote software attack from outside the system that requires a user inside the system to take some type of action?

A) The attacker has a back door into the system with a password created by a programmer and known only to him or her.
B) A computer programmer hides a Trojan horse in a program that will activate at a later time.
C) A worm is attached to a regular program that performs the malicious actions when a file or link is opened.
D) The attacker uses zombies or bots from many computers to request information from the company's computer.