In how many seconds, after a failure of the primary or active paths when BGP Fast Reroutes enables alternate paths?

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In how many seconds, after a failure of the primary or active paths when BGP Fast Reroutes enables alternate paths?
A . 5 seconds
B . 10 seconds
C . <1 second
D . 30 seconds

Answer: C

Explanation:

Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/12-2sr/irg-12-2srbook/irg-bgp-mp-pic.html