How can a Layer 3 MPLS VPN provider support customers with an overlapping IP address space?

How can a Layer 3 MPLS VPN provider support customers with an overlapping IP address space?
A . Each customer IP prefix is assigned a different RT value.
B . Each customer IP prefix is appended with a unique RD value.
C . Each customer route is injected into a separate GRE tunnel inside the MPSL core.
D . Each customer route is injected into a separate VPWS tunnel inside the MPSL core.

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Answer: B