During routine maintenance, G1/0/1 on DS1 was shutdown. All other interface were up. DS2 became the active HSRP device for Vlan101 as desired. However, after G1/0/1 on DS1 was reactivated. DS1 did not become the active HSRP device as desired. What need to be done to make the group for Vlan101 function properly?
A. Enable preempt on DS1s Vlan101 HSRP group
B. Disable preempt on DS1s Vlan101 HSRP group
C. Decrease DS1s priority value for Vlan101 HSRP group to a value that is less than priority value configured on DS2s HSRP group for Vlan101
D. Decrease the decrement in the track command for DS1s Vlan 101 HSRP group to a value less than the value in the track command for DS2s Vlan 101 HSRP group.

Answer: A

Explanation:

A is correct. All other answers is incorrect. Because Vlan101 on DS1 (left ) disable preempt. We need enable preempt to after it reactive, it will be active device. If not this command, it never become active device.