How can an engineer determine location-based CAC bandwidth requirements for Cisco Unified communication Manager?

How can an engineer determine location-based CAC bandwidth requirements for Cisco Unified communication Manager?
A . Execute the Resource Reservation protocol to return location-based requirements.
B . Calculate the number of calls against the license for Cisco Unified Border Element to determine calls per location.
C . Set the requirements in the service parameters.
D . Add the requirements for each audio and video codec and how many calls must be supported.

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Answer: D