Several Cisco 7961 IP Phones were initially registered to a Cisco Unified Communications
Manager cluster that is enabled with SRTP and TLS. When the same phones are moved to a new
Cisco Unified CM cluster, the phones are not registering to the new Cisco Unified CM cluster.
Which action can be taken to solve this problem?

A.
Manually enter the IP address, subnet mask, and default gateway into the Cisco 7961 phones.

B.
On the phone, press Settings. Press **#, press the more softkey, press Erase, and Exit.

C.
Copy the digital certificates from the original Cisco Unified CM cluster to the new cluster.

D.
Update the DHCP server on the new Cisco Unified CM cluster to include the certificate
authority.