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 reduces routing failures by allowing Layer 3 load balancing between OSPF neighbors that have the same link metric
C. It allows a router to use bridge priorities to create multiple loop-free paths to a single destination
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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