Why are R1 and R2 not exchanging routes between their VPNs?

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Referring to the exhibit, why are R1 and R2 not exchanging routes between their VPNs?
A. The route targets are not property configured.
B. The IP addresses in the BGP configuration must be in the same subnet.
C. The interfaces unit numbers must be the same on both sides.
D. The route distinguishers are not properly configured.

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