Question: In which of the following substates of 5GMM-DEREGISTERED is valid subscriber data not available for the UE?
Option 1: 5GMM-DEREGISTERED.PLMN-SEARCH
Option 2: 5GMM-DEREGISTERED.NO-SUPI
Option 3: 5GMM-DEREGISTERED.eCALL-INACTIVE
Option 4: 5GMM-DEREGISTERED.NO-CELL-AVAILABLE
Explanation: According to the specifications, valid subscriber data are available for the UE before it enters most substates of 5GMM-DEREGISTERED, except for the substate 5GMM-DEREGISTERED.NO-SUPI. This indicates that in the NO-SUPI substate, valid subscriber data may not be available for the UE.