Which model deals only with confidentiality?

A.
Bell-LaPadula

B.
Clark-Wilson

C.
Biba

D.
Reference monitor

Explanation:
The Bell-LaPadula model was developed for the U.S. government with the main goal of keeping sensitive data unreachable to those who were not authorized to access and view it. This model was the first mathematical model of a multi-level security policy used to define the concept of a security state, modes of access, and outlines rules of access. The Biba and Clark-Wilson models do not deal with confidentiality, but with integrity.