An engineer is designing a DMVPN topology for a client. The client wants all branch offices to connect to a hub at their data center and fall back to a different device in case of failure. Which DMVPN

In a dual hub single cloud design, both hub routers participate in the same multipoint GRE NBMA network. Spokes register with both hubs via NHRP, so if the primary hub fails, spokes automatically use the secondary hub within the same cloud - satisfying the failover requirement with the minimum number of devices and no additional cloud complexity.

Single hub dual cloud uses two completely separate NBMA networks each fronted by a single hub, duplicating the cloud infrastructure beyond what branch failover requires.

Dual hub dual cloud introduces two separate clouds each with a dedicated hub, creating unnecessary redundancy in both the hub and cloud layers.

Single hub single cloud has no redundancy; loss of the single hub disconnects all branches with no failover path.