Which of the following services provides users with directory services?

IMAP (Internet Message Access Protocol) is used for retrieving and managing email stored on a mail server and has no directory services function.

LDAP (Lightweight Directory Access Protocol) is purpose-built for accessing and maintaining distributed directory information services such as Microsoft Active Directory or OpenLDAP. It provides a hierarchical tree structure for authenticating and organizing users, groups, computers, and other objects, which is the defining characteristic of a directory service.

SFTP (SSH File Transfer Protocol) provides encrypted file transfer over an SSH channel and plays no role in user or resource directory management.

DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses and network parameters to clients, which is an addressing service, not a directory service.

DNS resolves domain names to IP addresses and operates as a name resolution service, not as a directory service for managing user identities, credentials, or organizational structure.