Your enterprise network is providing layer 2 connectivity between remote-sites using Q-in-Q
tunneling. A customer wants to ensure their connection through your network is also participating
in their spanning free topology. In this scenario, which solution must be used?

A.
You must configure the Q-in-Q tunnel to use L2PT to tunnel STP packets.

B.
You must configure the same isolation ID on both sides of the tunnel.

C.
You must configure spanning tree on the interfaces connected to the customers sites.

D.
You must configure spanning tree to tunnel packets.