单选题Which of the following is required to connect a partitioned p5-550 to a modem？（）AA modem adapterBAn async adapter and serial cableCAn Ethernet adapterDA 9-pin to 25-pin converter and serial cable
单选题
Which of the following is required to connect a partitioned p5-550 to a modem？（）
A
A modem adapter
B
An async adapter and serial cable
C
An Ethernet adapter
D
A 9-pin to 25-pin converter and serial cable
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解析：
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