Which configuration command is critical in order for OTV edge devices to maintain an overlay adjacency with their local peers in a multihomed site via the join interfaces across the Layer 3 network domain?
A. otv site-vlan <vlan-id>
B. otv extend-vlan <vlan-range>
C. otv use-adjacency-server <ip address> unicast-only
D. otv site-identifier <id>
