单选题Which of the following is the BEST tool to troubleshoot a DB-9 port?（）AOhm meterBAnti-static wrist strapCOscilloscopeDLoopback plug
单选题
Which of the following is the BEST tool to troubleshoot a DB-9 port?（）
A
Ohm meter
B
Anti-static wrist strap
C
Oscilloscope
D
Loopback plug
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