What is Control and User Plane Separation $($CUPS$)$ in $5$G$?$A$)$ CUPS eliminates the need for control plane functions, focusing only on user plane operations.B$)$ CUPS separates the control plane and user plane functions, allowing independent scaling ofboth in the packet core network.C$)$ CUPS is designed to simplify the integration of IoT devices with the $5$G network.D$)$ CUPS requires full integration of control and user plane functions in the $5$G core network.