When configuring users in a Cisco Unified Presence solution, what is the best way to ensure user consistency?

A.
Enable LDAP synchronization and LDAP authentication across the solution.

B.
Manually configure the user in Cisco Unified Presence server.

C.
Manually configure the user in Cisco Unified Communications Manager.

D.
Use the Bulk Administration Tool to import users into the Cisco Unified Presence server.