Question: When an Application Function (AF) subscribes to Access Network Charging Information notifications, how does the Policy and Charging Rules Function (PCRF) provide updates if the information is not initially available?
Option 1: The PCRF sends a new Authorization-Request (AR) with the updated Access Network Charging Information.
Option 2: The PCRF includes the information in the next scheduled reporting event to the AF.
Option 3: The PCRF waits for the AF to request the information again before providing an update.
Option 4: The PCRF sends a Re-Authorization-Request (RAR) command with the Specific-Action AVP set to "CHARGING_CORRELATION_EXCHANGE" when the information is received.
Explanation: This option is correct because, according to specified behavior for handling Access Network Charging Information notifications, if the PCRF lacks initial required information, it sends a Re-Authorization-Request (RAR) with Specific-Action AVP set to "CHARGING_CORRELATION_EXCHANGE" once information is available, ensuring timely AF notification without additional AF requests or delaying until a scheduled reporting event.