What is the difference between a RIB and a FIB?

What is the difference between a RIB and a FIB?
A . The FIB is populated based on RIB content.
B. The RIB maintains a mirror image of the FIB.
C. The RIB is used to make IP source prefix-based switching decisions.
D. The FIB is where all IP routing information is stored.

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Answer: A