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【单选题】
下列关于Fast Ethernet物理层标准的描述中，错误的是A.
100BASE-TX和100BASF-T4均采用全双工方式工作
B.
100BASE-T4使用3对双绞线传输数据，1对双绞线进行冲突检测
C.
100BASE-FX使用光纤传输数据，最大长度为415米
D.
100BASE-TX使用2对5类非屏蔽双绞线
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