Final answer:
The Ticket-Granting Service (TGS) is a component of Kerberos that issues tickets to authenticated clients, allowing them access to network resources.
Step-by-step explanation:
The Ticket-Granting Service (TGS) is part of Kerberos, a network authentication protocol designed to provide strong authentication for client/server applications. In the context of Kerberos, the correct answer to the question is d) Ticket-Granting Service. The Ticket-Granting Service is responsible for issuing tickets to clients after they have been authenticated by the Kerberos Key Distribution Center (KDC). These tickets allow clients to access network resources without needing to repeatedly authenticate themselves.