Question: In a 5G network, when is the 'Allowed' status ('01') updated in the non-volatile memory of the Mobile Equipment (ME) regarding Slices (S-NSSAI)?
Option 1: When Rejected NSSAI or Extended Rejected NSSAI IEs are received in a REGISTRATION REJECT message.
Option 2: When Allowed NSSAI IE is included in REGISTRATION ACCEPT or CONFIGURATION UPDATE COMMAND messages.
Option 3: During periodic updates of the ME's non-volatile memory, regardless of incoming NAS protocol messages.
Option 4: Upon receipt of a DEREGISTRATION REQUEST message with new S-NSSAI configurations.
Explanation: The correct answer is tied to how and when the 'Allowed' status for slices (S-NSSAI) is updated in the ME's memory. This update occurs specifically when the ME receives either a REGISTRATION ACCEPT or a CONFIGURATION UPDATE COMMAND message that includes an Allowed NSSAI IE, as these are the defined triggers for updating the allowed slices in non-volatile memory.