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 2 and updates routing protocols.
C . It has sub-second failure detection for layer 1 and layer 3 problems.
D . It has sub-second failure detection for layer 1 and layer 2 problems.

Answer: D