问题：

[单选] 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 VLAN.