Question: In the Scanning Priority List (EFSPL) for a Mobile Station, what is the correct mandatory priority order from highest to lowest for PLMN types?
Option 1: Preferred PLMNs, Home PLMN, Last Registered PLMN, Any Other PLMNs
Option 2: Home SID, Any Other SIDs, Positive SIs (Note: This option mixes SID and PLMN priorities)
Option 3: Home PLMN or Last Registered PLMN, Preferred PLMNs, Any Other PLMNs
Option 4: Any Other PLMNs, Preferred PLMNs, Last Registered PLMN, Home PLMN
Explanation: The mandatory PLMN priority order from highest to lowest is: either the Home PLMN or the Last Registered PLMN (highest), followed by Preferred PLMNs, and then Any Other PLMNs. This prioritizes the home network or the last connected network over preferred but non-home networks, and finally over all other available networks.