Which two design solutions ensure sub 50 msec of the convergence time after a link failure in the network? (Choose two)

Which two design solutions ensure sub 50 msec of the convergence time after a link failure in the network? (Choose two)
A . BFD
B . Ti-LFA
C . minimal BGP scan time
D . MPLS-FRR
E . IGP fast hello

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Answer: B,D