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