How should the IP-to-IP gateway be configured to support video codecs across all dial peers?

How should the IP-to-IP gateway be configured to support video codecs across all dial peers?

A.
Use the codec transparency enable command under the voice class codec in the Cisco Multiservice IP-to-IP Gateway.

B.
Configure codec class transparent in the gateway configuration page in Cisco CallManager.

C.
Use the codec preference command under the voice class codec in the Cisco Multiservice IP-to-IP Gateway.

D.
Use the codec command to configure codec transparency for the Cisco Multiservice IP-to-IP Gateway.