Which command MUST have been entered previously on switch S4820-1?

Refer to the exhibit.

On switch S4820-2, commands are entered.

The associated output is a follows:

Which command MUST have been entered previously on switch S4820-1?
A . S4820-1 (conf-pvst)#vlan 2 bridge-priority 4096
B . S4820-2 (conf-pvst)#vlan 2 bridge-priority 20480
C . S4820-1 (conf-pvst)#vlan 3 bridge-priority 20480
D . S4820-1 (conf-pvst)#vlan 3 bridge-priority 4096

View Answer

Answer: A