单选题Which of the following is required to connect a partitioned p5-550 to a modem？（）A A modem adapterB An async adapter and serial cableC An Ethernet adapterD A 9-pin to 25-pin converter and serial cable
题目
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