Question: Which entity initiates the release of a PDU session in a 5G system?
Option 1: SMF (Session Management Function)
Option 2: UE (User Equipment)
Option 3: AMF (Access and Mobility Management Function)
Option 4: gNB (Next-Generation Node B)
Explanation: The PDU SESSION RELEASE REQUEST message is sent by the UE to the SMF, indicating that the User Equipment initiates the release of a PDU session. This highlights the role of the UE in managing its own sessions and requesting releases when necessary.