Final answer:
GLBP is the protocol that can load balance among multiple routers, while HSRP and VRRP do not provide load balancing capabilities.
Step-by-step explanation:
Both HSRP (Hot Standby Router Protocol) and VRRP (Virtual Router Redundancy Protocol) are protocols that support gateway redundancy in a local area network. They provide failover capabilities by allowing multiple routers to share a virtual IP address. However, only GLBP (Gateway Load Balancing Protocol) is designed to perform load balancing among multiple routers, instead of just providing backup in case of a failure.