What is an advantage of using BFD?

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What is an advantage of using BFD?
A . It detects local link failure at layer 1 and updates routing table
B . It detects local link failure at layer 3 and updates routing protocols
C . It has sub-second failure detection for layer 1 and layer 2 problems
D . It has sub-second failure detection for layer 1 and layer 3 problems

Answer: C

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