A computer system that employs the necessary hardware and software
assurance measures to enable it to process multiple levels of classified or
sensitive information is called a:

A.
Trusted system.

B.
Open system.

C.
Closed system.

D.
Safe system.

Explanation:
The correct answer is Trusted system, by definition of a trusted system.
Answers Closed system and Open system refer to open, standard information on a product as
opposed to a closed or proprietary product. Answer Safe system is a distracter.