Question: What is the purpose of the Namf_Communication_N1N2MessageSubscribe service operation in the 5GS architecture?
Option 1: To notify the AMF about a UE's location update.
Option 2: To subscribe to a particular N1 message type or specific N2 information type about the UE.
Option 3: To request a UE's context information from the AMF.
Option 4: To establish a binding for the consumer NF to deliver subsequent Namf_Communication_N1MessageNotify or Namf_Communication_N2InfoNotify towards that NF.
Explanation: The correct answer is Option 4 because the Namf_Communication_N1N2MessageSubscribe service operation allows an NF to subscribe with the AMF to get notified of a particular N1 message type or specific N2 information type about the UE, and if allowed, the AMF creates a binding for the consumer NF to deliver subsequent notifications.