Question: What is the EPS update status value changed due to in a UE?
Option 1: Only after the execution of an attach or combined attach.
Option 2: After every successful or failed attempt of any procedure.
Option 3: Randomly, without any specific trigger.
Option 4: Only when the USIM is present and non-volatile memory in ME is full.
Explanation: The EPS update status value is changed only after specific procedures such as attach or combined attach, network initiated detach, authentication, tracking area update or combined tracking area update, service request or paging for EPS services using IMSI procedure or due to change in TAI which is not part of TAI list while timer T3346 is running.