On your campus, you have a controller in each building and they are close enough that users can roam seamlessly between them. You have received several complaints that users in your main building are experiencing one-way audio problems when they walk into the central building. What is the cause of this issue?
Select the best response.

A.
The client IP address is not in the routing table of the central building.

B.
The main building controller is blocking RTP packets inbound.

C.
A firewall is denying packets in one direction based on the source address.

D.
A firewall is blocking controller-to-controller traffic.