Question: What is the main purpose of the Tracking Area list management function in E-UTRAN?
Option 1: To allocate and reallocate a single Tracking Area Identity to the UE.
Option 2: To allocate and reallocate a set of tracking areas to the UE, reducing the chance of rapid tracking area updates.
Option 3: To determine the RAT type the UE is camping on based on the Tracking Area indicated in the INITIAL UE MESSAGE.
Option 4: To ensure the UE initiates tracking area update procedure when moving between MMEs with different EPS bearer support.
Explanation: The main purpose of the Tracking Area list management function is to allocate and reallocate a set of tracking areas to the UE, which reduces the chance of rapid tracking area updates by making the center of this set close to the UE's current location. This concept is specific to E-UTRAN and allows for more efficient tracking area management.