Which method is the best way to achieve this connectivity using the Internet as the only transport medium to access the other cloud regions?

Q69.As a managed service provider, you have a multiple environment where your CSRs in different regions that are developed at a cloud provider are terminating VPN tunnels from multiple customers in separate VRFs. Each of the regions has a subnet that is dedicated for the customer and so requires communication between the same customer networks in the sites through the CSR.

Which method is the best way to achieve this connectivity using the Internet as the only transport medium to access the other cloud regions?
A . Deploy an MPLS over GRE VPN tunnel
B . Setup a DMVPN, Which provides this functionality with standard configuration
C . Create a VPN tunnel with multi-VRF encapsulation
D . Deploy multiple site-to-site tunnels, one for each customer VRF

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Answer: B