A program that does not reproduce itself but pretends to be performing a legitimate action, while acting performing malicious operations in the background is the characteristic of which of the following?

A.
Worms

B.
Trapdoor

C.
Virus

D.
Trojan

Explanation:
D: A Trojan is a program that pretends to do one thing while performing another, unwanted action. A Trojan does not reproduce itself as do worms and viruses in order to spread. A trapdoor or backdoor is a hidden mechanism that bypasses access control measures. It is an entry point into a program that is inserted in software by programmers during the programs development to provide a method of gaining access into the program for modifi cation if the access control mechanism malfunctions and locks them out. Developers often refer to them as maintenance hooks. Page 217.