A _________ is an information path that is not normally used for communication within a computer system. It is not protected by the any of the systems security mechanisms.

A.
Trojaned program

B.
Backdoor

C.
Covert channel

D.
Hijacked session

E.
Back-path

Explanation:
Covert channels can be used as a secret way to convey information to another person or program or for other illicit means.