Question: What is the primary function of the 5GMM sublayer in the 5GS protocol?
Option 1: To manage the quality of service for user data transmission.
Option 2: To support UE identification, security, mobility, and generic message transport.
Option 3: To provide location services to the UE based on GNSS fixes.
Option 4: To handle the transmission of initial UL NAS messages in satellite NG-RAN access.
Explanation: The 5GMM sublayer plays a crucial role in supporting various functions related to UE identification, security, and mobility. It also provides generic message transport services, which is essential for the overall functioning of the 5GS protocol.