Refer to the exhibit. Why has this switch not been elected the root bridge for VLAN1?（）

• A、It has more than one interface that is connected to the root network segment.
• B、It is running RSTP while the elected root bridge is running 802.1d spanning tree.
• C、It has a higher MAC address than the elected root bridge.
• D、It has a higher bridge ID than the elected root bridge.