Refer to the exhibits.
Exhibit 1 -

Exhibit 2 -
Switch-1(config)# spanning-tree -
Switch-1(config)# spanning-tree config-name "exam"
Switch-1(config)# spanning-tree instance 1 vlan 10-19
Switch-1(config)# spanning-tree instance 2 vlan 20-29
Switch-2(config)# spanning-tree -
Switch-2(config)# spanning-tree config-name "exam"
Switch-2(config)# spanning-tree instance 1 vlan 10-19
Switch-2(config)# spanning-tree instance 2 vlan 20-29
Switch-2(config)# spanning-tree priority 0
Switch-2(config)# spanning-tree instance 1 priority 0
Switch-2(config)# spanning-tree instance 2 priority 1
Switch-3(config)# spanning-tree -
Switch-3(config)# spanning-tree config-name "exam"
Switch-3(config)# spanning-tree instance 1 vlan 10-19
Switch-3(config)# spanning-tree instance 2 vlan 20-29
Switch-3(config)# spanning-tree priority 1
Switch-3(config)# spanning-tree instance 1 priority 1
Switch-3(config)# spanning-tree instance 2 priority 0
Switch-4(config)# spanning-tree -
Switch-4(config)# spanning-tree config-name "exam"
Switch-4(config)# spanning-tree instance 1 vlan 10-19
Switch-4(config)# spanning-tree instance 2 vlan 20-29
The network administrator enters the commands shown in Exhibit 2. What is the spanning tree status on A1 and A2?