Implementing Cisco IP Switched Networks (SWITCH v2-0) (#397)

You have configured switches A and B in a network. The gigabitethernet0/1 interface of switch A has HSRP enabled on it for VLAN 30. Switch A has a priority of 240 and switch B has a priority of 200 for the HSRP group. You want to ensure that if the gigabitethernet0/1 interface of switch A goes down, then switch B becomes the active HSRP switch for the VLANs. You have executed the standby preempt command on switch B. Which of the following commands should be used on switch A to achieve the desired results?

standby 30 track gigabitethernet0/1
standby 30 track gigabitethernet0/1 10
standby 30 track gigabitethernet0/1 30
standby 30 track gigabitethernet0/1 45