When testing a CAT5 cable, the technician notices that pin A
题目内容(请给出正确答案)
单选题
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
