Question: When the PCRF removes the last ADC rule associated with a usage monitoring key, how does the TDF report accumulated usage if the ADC-Rule-Report AVP was included in an RAA command?
Option 1: The TDF includes the accumulated usage in the next CCR command with CC-Request-Type set to "INITIAL_REQUEST".
Option 2: The TDF sends a new CCA command to report the accumulated usage for the monitoring key.
Option 3: The TDF sends a new CCR command specifically to report accumulated usage, with CC-Request-Type set to "UPDATE_REQUEST" and Event-Trigger set to "USAGE_REPORT".
Option 4: The TDF does not send an additional message; the usage is assumed reported in the previous RAA command.
Explanation: This option correctly reflects the procedure for reporting accumulated usage when the last ADC rule associated with a monitoring key is removed, and the ADC-Rule-Report AVP was previously included in an RAA command. The TDF's action ensures that the accumulated usage for the monitoring key is properly reported back, aligning with efficient resource management and accurate billing in telecom networks.