Back Orifice is an example of:

A. a virus.

B. a legitimate remote control software.

C. a backdoor that takes the form of an installed program.

D. an eavesdropper.

E. None of the choices.

Explanation:

-A backdoor may take the form of an installed program (e.g., Back Orifice) or could be in the form of an existing -legitimate- program, or executable file. A specific form of backdoors are rootkits, which replaces system binaries and/or hooks into the function calls of the operating system to hide the presence of other programs, users, services and open ports.-