Question: What happens to the TMSI and LAI stored in the SIM/USIM when an AUTHENTICATION REJECT message is received by the mobile station?
Option 1: The TMSI and LAI are updated with new values.
Option 2: The TMSI and LAI remain unchanged.
Option 3: The TMSI and LAI are deleted, but only if the message has been successfully integrity checked by the lower layers.
Option 4: The TMSI and LAI are deleted, regardless of whether the message has been successfully integrity checked by the lower layers or not.
Explanation: According to the text, when an AUTHENTICATION REJECT message is received by the mobile station, if the message has been successfully integrity checked by the lower layers, the mobile station shall delete from the SIM/USIM the stored TMSI and LAI.