Users of a Cisco Unified Presence solution are configured with directory synchronization. What is required for Cisco Unified Personal Communicator logins to authenticate with the directory?

A.
a secure link with Cisco Unified Communications Manager database

B.
LDAP authentication enabled on Cisco Unified Presence

C.
DC-Directory authentication with Cisco Unified Communications Manager

D.
LDAP authentication enabled on Cisco Unified Communications Manager