Question: In Sponsored Data Connectivity, what triggers the PCRF to generate a monitoring key and request usage monitoring control for a PCC rule?
Option 1: Receipt of the Application-Service-Provider-Identity AVP alone
Option 2: Receipt of the Sponsor-Identity AVP alone
Option 3: Setting of the Reporting-Level AVP to any value other than SPONSORED_CONNECTIVITY_LEVEL
Option 4: Receipt of usage thresholds from the AF, accompanied by a valid Sponsor-Identity AVP
Explanation: This is correct because when the PCRF receives usage thresholds from the Application Function (AF) and has a valid sponsor identity, it generates a monitoring key to request usage monitoring control. Both usage thresholds and sponsor identity are crucial for initiating this process.