单项选择题

When testing a CAT5 cable, the technician notices that pin A is open. However, the cable stillworks fine. Which of the following describes how this is possible?（）

A. The cable was tested for 100Base-TX.
B. The cable is a 1000BaseT cable.
C. The switch uses link aggregation,
D. The switch was setup to use MDIX

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单项选择题

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