An organization uses a Kerberos-based LDAP service for network authentication. The service is also
utilized for internal web applications. Finally access to terminal applications is achieved using the same
authentication method by joining the legacy system to the Kerberos realm. This company is using
Kerberos to achieve which of the following?

A.
Trusted Operating System

B.
Rule-based access control

C.
Single sign on

D.
Mandatory access control