Question: What is the primary purpose of the GMM cause information element in a mobile network?
Option 1: To authenticate the user equipment (UE) before allowing access to the network.
Option 2: To prioritize traffic from different UE based on their subscription plans.
Option 3: To indicate the reason why a General Packet Radio Service (GPRS) Mobility Management (GMM) request is rejected by the network.
Option 4: To manage Quality of Service (QoS) for different applications running on the UE.
Explanation: The GMM cause information element is used to inform the mobile station about the reason behind the rejection of its GMM request. This helps in identifying and resolving issues related to mobility management, ensuring seamless connectivity and service availability for the user.