ATrusted Computing Base (TCB) is defined as:

A.
The total combination of protection mechanisms within a computer
system that are trusted to enforce a security policy.

B.
A system that employs the necessary hardware and software assurance measures to enable
processing multiple levels of classified or sensitive information to occur.

C.
The boundary separating the trusted mechanisms from the remainder of the system.

D.
A trusted path that permits a user to access resources.

Explanation:
* Answer “The boundary separating the trusted mechanisms from the remainder of the system” is
the security perimeter.
* Answer “A trusted path that permits a user to access resources” is the definition of a trusted
path.
* Answer “A system that employs the necessary hardware and software assurance measures to
enable processing multiple levels of classified or sensitive information to occur” is the definition of

a trusted computer system.