Question: In a GPRS context, when an Application Function (AF) instructs to report changes of IP-CAN bearer level information, what additional information may be reported even if the IP-CAN type remains unchanged?
Option 1: Only the new IP address assigned to the UE (User Equipment)
Option 2: The updated QoS (Quality of Service) parameters for the IP-CAN
Option 3: Changes in RAT (Radio Access Technology) type
Option 4: The reason for the IP-CAN bearer modification
Explanation: According to the policy and charging control architecture, when an Application Function (AF) requests updates on IP-CAN bearer level information for GPRS, even if the IP-CAN type itself doesn't change, notifications may still include changes in the Radio Access Technology (RAT) type. This is crucial for network management and resource allocation, especially in heterogeneous network environments where RAT changes can impact service delivery and charging.