The switched LAN is shown below： Study the exhibit above carefully. Switch SW5 is configured as the root switch for VLAN 10 but notfor VLAN 20. If the STP configuration is correct， what will be true about Switch SW5？（）

• A、All ports in VLAN 10 will be in forwarding mode and all ports in VLAN 20 will be in standbymode
• B、All ports will be in forwarding mode
• C、All ports in VLAN 10 will be in forwarding mode and all ports in VLAN 20 will be in blockingmode
• D、All ports in VLAN 10 will be in forwarding mode
• E、None of the other alternatives apply