单选题Which of the following should a technician MOST likely use to test a RS-232 port?（）ALoopback adapterBPower supply testerCThe ping commandDMultimeter
单选题
Which of the following should a technician MOST likely use to test a RS-232 port?（）
A
Loopback adapter
B
Power supply tester
C
The ping command
D
Multimeter
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