Question: In a Policy and Charging Control (PCC) architecture, what is a mandatory component of the CoA-Information AVP sent from the PCEF to the PCRF, aside from the Tunnel-Information AVP?
Option 1: UE-IP-Address AVP
Option 2: CoA-IP-Address AVP
Option 3: APN-AMBR-List AVP
Option 4: Service-URN AVP
Explanation: The CoA-Information AVP necessitates the inclusion of both the CoA-IP-Address AVP (to specify the care-of address) and the Tunnel-Information AVP. The CoA-IP-Address AVP is crucial as it directly relates to the care-of-address, making it a mandatory inclusion alongside tunnel information in communications between PCEF and PCRF.