Question: What information does a UE include in an ATTACH REQUEST message when initiating a combined attach procedure if it has stored a valid location area identification?
Option 1: Old location area identification IE and TMSI status IE
Option 2: Only the Old location area identification IE
Option 3: Only the TMSI based NRI container IE
Option 4: No additional information is included
Explanation: According to the 3GPP specification, when a UE initiates a combined attach procedure and has stored a valid location area identification, it shall include this information in the Old location area identification IE in the ATTACH REQUEST message. Additionally, if no valid TMSI is available, the UE shall also include the TMSI status IE.