What is the cause of the failure?

An engineer has two cisco UCM Clusters and wants to integrate them using ILS with TLS certificates. Cluster A (pub and 1 subscriber) will be the hub, and Cluster B (pub and 1 subscriber) will be the spoke. Both Clusters have self-signed certificates. The engineer has exchanged Publisher A and subscriber B Tomcat certificates, but the connection fails .

What is the cause of the failure?
A . The password is incorrect.
B . Cluster IDs are not unique.
C . The tomcat certificate from Cluster B must be the publisher.
D . The engineer needs to exchange the CallManager certificate.

Answer: C