Which option describes the reason that transcoding resources are added in Cisco Unified Communications Manager?
A.
to enable transcoding resources in a Cisco Unified Communications Manager server
B.
to enable Cisco Unified Communications Manager to select the optimal single codec for end-to-end calls
C.
to enable transcoding resources in Cisco IP Phones
D.
to provide transcoding resources in Cisco IOS gateways to Cisco Unified Communications Manager