Which solution allows overlay VNs to communicate with each other in an SD-WAN Architecture?

Which solution allows overlay VNs to communicate with each other in an SD-WAN Architecture?
A . External fusion routers can be used to map VNs to VRFs and selectively route traffic between VRFs.
B . GRE tunneling can be configured between fabric edges to connect one VN to another.
C . SGTs can be used to permit traffic from one VN to another.
D . Route leaking can be used on the fabric border nodes to inject routes from one VN to another.

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Answer: B