What is the fastest way for an engineer to test the implementation of SRST in a production environment?
A.
Shut down the Cisco Unified Communications Manager Servers.
B.
Shut down the switch ports connected to the Cisco Unified Communications Manager Servers.
C.
Add a null route to the publisher Cisco Unified Communications Manager at the remote router. Remove the null route when the operation is verified.
D.
Unplug the IP phones from their switch ports.
E.
Verification is not needed.