What are the three conditions that must be met by the reference monitor?

A.
Confidentiality, availability and integrity.

B.
Policy, mechanism and assurance.

C.
Isolation, layering and abstraction.

D.
Isolation, completeness and verifiability.

Explanation:
These are three of the main characteristics of a Reference Monitor. You need
Isolation, because it cant be of public access, the less access the better. It must have a sense of
completeness to provide the whole information and process cycles. It must be verifiable, to provide
security, audit and accounting functions.