What is the relationship between a Region and a Location?

What is the relationship between a Region and a Location?

A.
The Region codec parameter is used between a Region and its configured Locations.

B.
The Region setting for a Location sets the number of audio and video calls that Location can support.

C.
The codec parameter configured in the Region is only used between Regions and Location bandwidth is only used between Locations.

D.
The Region codec parameter is combined with Location bandwidth when communicating with other Regions.

Explanation: