Overlay Transport Virtualization （OTV） uses the Authoritative Edge Device （AED） to perform which tasks？（）
A. The AED is responsible for sending all unicast traffic in a site， while either node in a site can transmit multicast and broadcast.
B. The AED is responsible for load balancing all traffic for all VLANs across the transport network.
C. The AED is responsible for handling all unicast， broadcast， and multicast traffic for a given VLAN within a site.
D. The AED is responsible for MAC address dispute contention for a given VLA
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