Which statement is correct about the SDN controller?

The software-defined network (SDN) controller replaces the control plane on SDN devices. The SDN devices in the network do not contain a control plane locally and instead are controlled by the SDN controller. The SDN controller does not configure the management plane of the network devices; it replaces the management plane of the network devices. The SDN controller does not monitor the data plane of traffic; it only controls the traffic. The SDN controller does not complement the control plane of the SDN device; it replaces the control plane of the SDN device.