Which of the following configurations is required to enable fast reroute for this LSP?

Click on the exhibit.

The LSP "toR6" is configured with a fully strict path on an Nokia 7750 SR .

Which of the following configurations is required to enable fast reroute for this LSP?
A . Enable fast-reroute on all routers along the path. R1, R2, R4, and R6.
B . Enable both link-protection and node-protection on router R1.
C . Enable fast-reroute with either one-to-one or facility mode on this LS
E . Enable link-protection only on router R4.

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Answer: C