Refer to the exhibit. Which statement is true?（）

• A、The Fa0/11 role confirms that SwitchA is the root bridge for VLAN 20.
• B、VLAN 20 is running the Per VLAN Spanning Tree Protocol.
• C、The MAC address of the root bridge is 0017.596d.1580.
• D、SwitchA is not the root bridge, because not all of the interface roles are designated.