With VPLS， which protocol is used for label exchange and PW signalling？（）

A.Deploy IPv6 at the Edges and tunnel Enterprise through the core
B.Deploy IPv6 at Edges and Core at the same time for smooth transition
C.Deploy IPv6 at the core first and then move to Edges toward the end customer
D.None of the above will work

A.121
B.115
C.110
D.101
E.151
F.51