Question: In a Policy and Charging Control (PCC) scenario, when the Metering-Method AVP is omitted but was previously supplied for offline charging, what happens to the previously provided metering method information?
Option 1: It becomes invalid immediately, requiring a new AVP to be sent.
Option 2: The previous information remains valid and continues to be used.
Option 3: The system defaults to metering by DURATION (0) as a fallback.
Option 4: The PCEF requests clarification through an additional Diameter message.
Explanation: According to the specifications, if the Metering-Method AVP is omitted but has been supplied previously, the previous information remains valid. This ensures continuity in the metering approach for offline charging without requiring immediate updates or defaults to other methods when no new AVP is provided.