What is the primary purpose of a First Hop Redundancy Protocol?

What is the primary purpose of a First Hop Redundancy Protocol?
A . It allows directly connected neighbors to share configuration information.
B . It allows a router to use bridge priorities to create multiple loop-free paths to a single destination.
C . It reduces routing failures by allowing Layer 3 load balancing between OSPF neighbors that have the same link metric.
D . It reduces routing failures by allowing more than one router to represent itself, as the default gateway of a network.

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Answer: D