Question: What triggers a UE to store an entry in the list of "PLMNs not allowed to operate at the present UE location"?
Option 1: When the UE receives a message including 5GMM cause value #78 via satellite NG-RAN access technology.
Option 2: When the UE successfully registers with a PLMN via satellite NG-RAN access technology.
Option 3: When the UE is in 5GMM-DEREGISTERED.LIMITED-SERVICE state and an entry from the list of "PLMNs not allowed to operate at the present UE location" is removed.
Option 4: When the UE switches off and the USIM remains in the UE.
Explanation: According to the text, a UE stores an entry in the list of "PLMNs not allowed to operate at the present UE location" when it receives a message including 5GMM cause value #78 via satellite NG-RAN access technology. This is specified in the first sentence of the paragraph.