Refer to the diagram. Which solution must be used to send traffic from the foreign wireless LAN controller to the anchor wireless LAN controller?

Refer to the diagram. Which solution must be used to send traffic from the foreign wireless LAN controller to the anchor wireless LAN controller?

A. Send packets without encapsulation to the anchor controller over the routed network. B. Encapsulate packets into an EoIP tunnel and send them to the anchor controller. C. Send packets from the foreign controller to the anchor controller via Layer 3 MPLS VPN or VRF-Lite. D. Send packets from the foreign controller to the anchor controller via IPinIP or IPsec tunnel.