What is the value of OSPF and BFD linkage?

What is the value of OSPF and BFD linkage?
A . The hello sending interval of OSPF is at the second level, which is faster than BFD inductive link state
B . The sending interval of BFD packets can reach the millisecond level, which is slower than the OSPF inductive link state
C . Through the BFD detected at the millisecond level, the OSPF status is associated to achieve the purpose of OSPF quickly inductive link state
D . Any change in the BFD status will not affect the OSPF neighbor status

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Answer: C