Verify Database Replication Health in Cisco Unified CM Cluster 9.1

D.

The correct answer is E. Cisco Unified Serviceability.

Explanation: In a two-server Cisco Unified CM cluster running version 9.1, you can verify the database replication health using the Cisco Unified Serviceability web administration page.

Here are the steps to verify the database replication health in Cisco Unified Serviceability:

1. Log in to the Cisco Unified CM Administration web interface using a web browser.
2. Choose System > Serviceability from the menu.
3. Click Tools > Control Center - Network Services.
4. Choose the server you want to verify the database replication health for from the list of servers in the cluster.
5. Click the Go button.
6. Click the Cisco CallManager (Active) service.
7. Click the Database Replication link in the Related Links area.
8. On the Database Replication page, you can view the replication status for each server in the cluster.

If the replication status is "2 - Replicating", it indicates that the database is replicating correctly between the servers. If the replication status is anything other than "2 - Replicating", it indicates that there is a problem with database replication that needs to be addressed.

Therefore, the correct answer is E. Cisco Unified Serviceability.