How is sub-second failure of a transport link detected in a Cisco SD-WAN network?

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How is sub-second failure of a transport link detected in a Cisco SD-WAN network?
A . Hellos are sent between the WAN Edge routers and the vSmart controller.
B . BFD runs on the IPsec tunnels between WAN Edge routers.
C . BGP is used between WAN Edge routers and the vSmart controller.
D . Link state change messages are sent between vSmart controllers.

Answer: B