Question: In a USIM's EF5GS3GPPLOCI file, what does the coding of Byte 20 (Bits: b3 b2 b1) represent for 3GPP access in a 5GS network?
Option 1: The type of 5G-GUTI allocated to the UE
Option 2: The status of 5GS update (e.g., UPDATED, NOT UPDATED, ROAMING NOT ALLOWED)
Option 3: The format version of the Tracking Area Identity (TAI) information element
Option 4: The indication of support for Non-Access Stratum (NAS) protocols
Explanation: Byte 20's Bits b3 b2 b1 in the EF5GS3GPPLOCI file indicate the status of the 5GS update for 3GPP access, including states like 'UPDATED', 'NOT UPDATED', and 'ROAMING NOT ALLOWED', which is crucial for understanding how a USIM manages and reports its update status within a 5G network.