Question: What is the purpose of the NEF storing the AF request into the selected UDR instance as the Data Subset of the Application data?
Option 1: To trigger a PCC rule change from the PCF to the SMF for existing PDU Sessions.
Option 2: To allow the PCF(s) to receive notifications from the UDR about AF request information and make policy decisions for existing and future relevant PDU Sessions.
Option 3: To map UE (group) identifiers provided by the AF to identifiers used within the 5GC.
Option 4: To validate the AF request and perform possible parameter mapping.
Explanation: The correct answer is Option 2 because the NEF stores the AF request into the selected UDR instance as the Data Subset of the Application data, which allows the PCF(s) to receive notifications from the UDR about AF request information. This enables the PCF(s) to take the received AF request information into account when making policy decisions for existing and future relevant PDU Sessions.