What is an advantage of using BFD?

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.

View Answer

Answer: D