Question: Upon receiving an AF request for an individual UE identified by IP/Ethernet address, if the NEF supports HR-SBO scenarios but determines the PDU session is not in HR-SBO mode, what does the NEF do next to retrieve related PCF information?
Option 1: The NEF directly invokes the Npcf_PolicyAuthorization service with the PCF.
Option 2: The NEF interacts with the BSF by invoking the Nbsf_Management_Discovery service operation first.
Option 3: The NEF responds to the AF with a default traffic influence subscription settings.
Option 4: The NEF deletes any existing 'Individual Traffic Influence Subscription' resource.
Explanation: According to the procedure for handling AF requests when the PDU session is not in HR-SBO mode, the NEF first interacts with the Binding Support Function (BSF) to retrieve related Policy Control Function (PCF) information by invoking the Nbsf_Management_Discovery service operation, a prerequisite before engaging with the PCF for policy authorization.