When designing fast convergence on a network using loop-free alternate, on which two basis can the next-hop routes be precomputed? (Choose two)

When designing fast convergence on a network using loop-free alternate, on which two basis can the next-hop routes be precomputed? (Choose two)
A . Per neighbor
B . Per network type
C . Per link
D . Per prefix
E . Per failure type

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Answer: C,D