How are MPLS layer 3 VPN services deployed?

How are MPLS layer 3 VPN services deployed?
A . The RD and RT values must match under the VRF
B . The RD and RT values under a VRF must match on the remote PE router
C . The import and export RT values under a VRF must always be the same
D . The label switch path must be available between the local and remote PE routers

Answer: D