Question: What is the primary purpose of NAS signalling connection management in the 5G System?
Option 1: To manage user data transmission between the UE and the network.
Option 2: To handle authentication and authorization procedures for UE access.
Option 3: To establish and release a NAS signalling connection for signalling message exchange.
Option 4: To monitor and control network resources for quality of service (QoS) management.
Explanation: NAS signalling connection management is responsible for setting up and tearing down the signalling connection between the UE and the network, enabling the exchange of signalling messages. This function is crucial for various procedures such as registration, session establishment, and mobility management.