When a Cisco Unified Border Element is deployed to support RSVP-based CAC, which media flow method is required?

A.
RSVP-based CAC can be supported with either media flow-through or media flow-around if the Cisco Unified Communications Manager is configured as an RSVP agent.

B.
RSVP-based CAC only supports media flow-around.

C.
The Cisco Unified Border Element does not have to participate in the RSVP message exchange and will pass RSVP messages through unchanged using media flow-around.

D.
RSVP-based CAC requires Cisco Unified Border Element to use media flow-through.

Explanation: