Question: In a dedicated core network serving NB-IoT UEs that may enter power saving mode, where must buffering capability be supported?
Option 1: Only in SGW-U (Serving and Packet Data Network Gateway - User plane)
Option 2: Only in SGW-C (Serving and Packet Data Network Gateway - Control plane)
Option 3: Either in SGW-U or SGW-C, based on UE capability
Option 4: Not required in either SGW-U or SGW-C for NB-IoT UEs
Explanation: The SGW-C (Serving and Packet Data Network Gateway - Control plane) is required to support buffering capability for efficient handling of UEs in power-saving or eDRX modes, critical for IoT applications where devices are often in low-power states.