Which two mechanisms control route distribution between PE routers in a 2547bis VPN？（）

A.show ldp neighbor
B.show martini connections
C.show l2circuit connections
D.show l2vpn connections

A.an LSP for each local CE device
B.an LSP for each remote PE device
C.an LSP for each remote CE device
D.an LSP for each CE facing interface

A.Configure a site ID for each CE
B.Configure a VPN label for each VPN
C.Configure a MP-BGP session to each PE
D.Configure an Extended LDP Session to each PE