How does HSRP provide first hop redundancy?

How does HSRP provide first hop redundancy?
A . It load-balances traffic by assigning the same metric value to more than one route to the same destination m the IP routing table
B . It load-balances Layer 2 traffic along the path by flooding traffic out all interfaces configured with the same VLAN
C . It forwards multiple packets to the same destination over different routed links in the data path
D . It uses a shared virtual MAC and a virtual IP address to a group of routers that serve as the default gateway for hosts on a LAN

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Answer: D