A server administrator needs to configure a server to store usernames and passwords for accounts used to log on to the network. Which of the following server roles should the administrator configure?

A print server manages shared printer resources on a network and has no role in storing or managing user account credentials.

An application server hosts and executes applications for clients but is not responsible for centralized network authentication or credential storage.

A messaging server handles email or instant messaging delivery and does not store or manage network login accounts.

A directory server, such as one running Active Directory Domain Services, is built specifically to store usernames, passwords, and account metadata for network authentication. It provides centralized identity management so users can log on to the network with a single set of credentials. This is its primary role, distinguishing it from other server types that serve unrelated functions.

A database server stores structured application or business data but is not specifically designed for centralized network authentication.