Which solution minimizes the downtime to the sub-second?

Refer to the exhibit.

The failover time of ISP-2 is significantly shorter than ISP-1 when an interface on the ISP router toward the campus network fails.

Which solution minimizes the downtime to the sub-second?
A . Aggressive timers
B. Next-hop address tracking
C. Graceful-restart
D. BFD

Answer: D

Explanation:

https://www.cisco.com/c/en/us/td/docs/ios/12_2sb/feature/guide/sbbnhop.html

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