Question: How is the monitoring key set for a PCRF-provided PCC rule to enable usage monitoring control?
Option 1: Using the Monitoring-Key AVP within the Charging-Rule-Definition AVP of the PCC rule
Option 2: Including the monitoring key in the predefined rule definition at the PCRF
Option 3: Activating usage monitoring for all service data flows associated with the PCC rule at the PCEF
Option 4: Setting the monitoring key through a separate Usage Monitoring Control AVP in the PCC rule provisioning procedure
Explanation: For a PCRF-provided PCC rule, the specific attribute used to set the monitoring key is the Monitoring-Key Attribute Value Pair (AVP) located within another AVP called Charging-Rule-Definition. This setup allows for precise control over usage monitoring on a per-rule basis as defined by the Policy and Charging Rules Function (PCRF).