Question: What happens to a UE in MICO mode when it needs to send mobile originated signalling or user data?
Option 1: The UE remains in MICO mode and buffers the data.
Option 2: The UE automatically switches to another PLMN.
Option 3: The UE initiates a 5GMM procedure for cell reselection.
Option 4: The UE deactivates MICO mode by activating the AS layer.
Explanation: When a UE in MICO mode needs to send mobile originated signalling or user data, it can deactivate MICO mode at any time by activating the AS layer. This allows the UE to initiate the necessary procedures for sending the data.