Implementing Cisco IP Switched Networks (SWITCH v2-0) (#508)

Which statement best describes the function of Hot Standby Router Protocol (HSRP)?

HSRP specifies a single IP address that all routers in the group must use.
HSRP defines a set of routers that represent one virtual, fault-tolerant router.
HSRP provides a round-robin gateway selection process to increase fault tolerance.
HSRP defines a frame-tagging scheme that allows end stations to use any router as a gateway.