Which device provides connectivity between one or more VMware vCloud Director external networks and

Which device provides connectivity between one or more VMware vCloud Director external networks and one or more organization networks?

A. external router

B. edge gateway

C. network switch

D. VXLAN

Reference: https://pubs.vmware.com/vcd-820/topic/com.vmware.ICbase/PDF/vcd_820_user_guide.pdf