A. The spine switch drops the Layer 2 unknown unicast packet if it is unable to find the MAC address in the proxy database.

B. The Layer 2 unknown hardware proxy lacks support of the topology change notification.

C. The leaf switch forwards the Layers 2 unknown unicast packets to all other leaf switches if it is unable to find the MAC address in its local forwarding tables.

D. The leaf switch drops the Layer 2 unknown unicast packet if it is unable to find the MAC address in the local forwarding tables.