Question: When a PCEF detects that an access has become unavailable, what information MUST it include in the CCR command sent to the PCRF, alongside the Event-Trigger set to UNAVAILABILITY_OF_ACCESS?
Option 1: Only the Access Type information within the IP-CAN-Type
Option 2: Both the Access Type information within the IP-CAN-Type and the reason for unavailability within the Access-Availability-Change-Reason
Option 3: The Charging Rule Name within the Charging-Rule-Name
Option 4: The User Equipment's (UE) IP address
Explanation: When an access becomes unavailable, the PCEF must inform the PCRF with detailed information to facilitate policy and charging updates. This includes not just the type of access that has become unavailable, but also the reason for this unavailability. This dual reporting ensures the PCRF can make informed decisions regarding rule updates or removals, impacting billing and service continuity.