Question: How does the 5G Core (5GC) control the access of a User Equipment (UE) that does not support Closed Access Group (CAG) functionality to a Mobile Base Station Relay (MBSR)?
Option 1: By using the CAG identifier broadcast by the MBSR.
Option 2: By managing the allowed CAG list in the UE's subscription information.
Option 3: By managing the forbidden tracking area for the UE.
Option 4: By indicating to the MBSR-UE that it is not allowed to operate as MBSR during registration procedure.
Explanation: According to the text, for a UE not supporting CAG functionality, the 5GC can control its access by managing the forbidden tracking area. This ensures that the UE cannot access the MBSR cell outside of the allowed areas.