Replication fails in a large Cisco Unified Communications Manager cluster that contains eight nodes. There are no issues with reachability between cluster nodes, and the utils dbreplication runtimestate command shows "out of sync" or "not requested" statuses. Which reason that is occurring is true?

A.	The replication timeout is too small
B.	Authentication failed on at least one of the nodes
C.	The clock of the Publisher is not synchronized
D.	The tables on one or more nodes are mismatched