A spoke has two Internet connections for failover. How can you achieve optimum failover without affecting any other router in the DMVPN cloud?

A spoke has two Internet connections for failover. How can you achieve optimum failover without affecting any other router in the DMVPN cloud?
A . Create another DMVPN cloud by configuring another tunnel interface that is sourced from the second ISP link.
B . Use another router at the spoke site, because two ISP connections on the same router for the same hub is not allowed.
C . Configure SLA tracking, and when the primary interface goes down, manually change the tunnel source of the tunnel interface.
D . Create another tunnel interface with same configuration except the tunnel source, and configure the if-state nhrp and backup interface commands on the primary tunnel interface.

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Answer: C