What is a design aspect regarding multicast transport for MPLS Layer 3 VPNs using the Rosen Draft implementation?

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What is a design aspect regarding multicast transport for MPLS Layer 3 VPNs using the Rosen Draft implementation?
A . LDP is the multicast control plane protocol.
B . Multicast traffic is forwarded over GRE tunnels.
C . Multicast traffic is forwarded over LDP or RSVP signaled LSPs.
D . Using the MDT SAFI in BGP ensures that PIM can be disabled in the core.

Answer: B