Which two statements about MPLS label-switched paths (LSPs) are true? (Choose two.)

Which two statements about MPLS label-switched paths (LSPs) are true? (Choose two.)
A . LSPs are bidirectional.
B . LSPs are unidirectional.
C . LSPs must follow the IGP’s shortest path.
D . LSPs can follow paths other than the IGP’s shortest path.

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Answer: B, D