Question: What indicates a successful SM policy association update notify to the Policy Control Function (PCF) in a 5G network, triggering an increment in the relevant subcounter per S-NSSAI?
Option 1: Receipt of any response message from the Session Management Function (SMF)
Option 2: Expiration of a timer set for SM policy association updates
Option 3: Receipt of a '200 OK' or '204 No Content' response message sent by the SMF
Option 4: Automatic periodic update of SM policies on the PCF
Explanation: In the context of 5G network management, specifically for SM policy association updates, a successful notification is confirmed when the Policy Control Function (PCF) receives specific acknowledgement messages from the Session Management Function (SMF). These acknowledgements are in the form of '200 OK' or '204 No Content' response messages, ensuring that the update was successfully processed, prompting an increment in the success counter for the relevant S-NSSAI.