Which mode of operations has objects and subjects with various security labels, from least to most secure or trusted?

A.
Compartmented

B.
Dedicated

C.
Multilevel Secure

D.
System High

Explanation:
Answer C is correct; Multilevel secure mode has mixed objects and subjects: the reference monitor mediates access between subjects and objects.

Incorrect Answers and Explanations: A, B, and D: Answers A, B, and D are incorrect. Compartmented mode has mixed objects, and subjects must have a clearance matching the highest object label in the system, as well as a need to know. Dedicated mode has objects of one classification level; subjects must possess a clearance at least as high as the objects label. System high mode has mode has mixed objects, and subjects must have a clearance matching the highest object label in the system.