Question: What is the primary purpose of the Nnef_MemberUESelectionAssistance_Subscribe service operation in the 5G System?
Option 1: To update an existing subscription for Member UE selection assistance information.
Option 2: To unsubscribe from receiving Member UE selection assistance information.
Option 3: To request a list of available NF consumers for Member UE selection assistance.
Option 4: To subscribe to receive Member UE selection assistance information or update an existing subscription.
Explanation: The Nnef_MemberUESelectionAssistance_Subscribe service operation is used by the NF consumer to either subscribe to receive Member UE selection assistance information for the first time or to update an existing subscription. This allows the NF consumer to receive the necessary information to assist in selecting the most suitable UEs for communication, based on various filtering criteria such as GPSI or UE IP addresses.