Which item is not part of a Kerberos authentication implementation?

A.
Message Authentication Code

B.
Ticket granting service

C.
Authentication service

D.
Users, programs, and services

Explanation:
Message Authentication Code (MAC) is a cryptographic function and is not a key component of Kerberos. Kerberos is made up of a KDC, a realm of principals (users, services, applications, devices), an authentication service, tickets, and a ticket granting service.