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