Question: What is the purpose of including the "MS Identity" Information Element (IE) in a combined Tracking Area/Locator Area (TA/LA) update?
Option 1: To request location information from the User Equipment (UE).
Option 2: To assign or unassign a new Temporary Mobile Subscriber Identity (TMSI) to a UE.
Option 3: To update the UE's International Mobile Subscriber Identity (IMSI).
Option 4: To notify the UE of a change in the network's Public Land Mobile Network (PLMN) identity.
Explanation: The "MS Identity" IE is used to assign or unassign a new TMSI to a UE during a combined TA/LA update, which is essential for maintaining the UE's anonymity and security in the Evolved Packet System (EPS).