单项选择题
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.
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