Question: What is the primary purpose of including the Serving PLMN Rate Control Information Element (IE) in a message?
Option 1: To indicate the minimum downlink data rate that the User Equipment (UE) can handle.
Option 2: To request the UE to perform a specific procedure for network optimization.
Option 3: To inform the UE of the maximum uplink control plane user data it is allowed to send within a specified time interval.
Option 4: To notify the UE about changes in the network's Quality of Service (QoS) policies.
Explanation: The Serving PLMN Rate Control IE is used by the network to control the amount of uplink control plane user data that the UE can send within a specific time interval, which is 6 minutes in this case. This helps the network manage its resources and prevent overload.