You are setting up a Cisco Catalyst 4900 Series Switch, and would like to be able to do two things:
enable tracking for interface GigabitEthernet 3/20 in VRRP group 3 decrement VRRP router priority by 10
Which command would you use?

A.
4900(config-if)# vrrp 3 track GigabitEthernet3/20 decrement 10

B.
4900(config-vrrp)# track GigabitEthernet3/20 decrement 10

C.
4900(config)# vrrp 3 tracking GigabitEthernet3/20 10

D.
4900(config-if)# vrrp 3 track GigabitEthernet3/20

Explanation:
decrement of 10 is the default. Otherwise A will be correct