Which of the following should a technician MOST likely use to test a RS-232 port?（）A、Loopback adapterB、Power supply testerC、The ping commandD、Multimeter
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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