英语翻译What is the difference between a CSU/DSU and a modem?CSU

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英语翻译
What is the difference between a CSU/DSU and a modem?
CSU/ DSU和调制解调器之间的区别是什么?
A.A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.
B.A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.
C.A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.
D.A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.
四个选项看不懂,

A.一CSU / DSU转换从一个路由器/模拟信号到租用线路；一个调制解调器转换成模拟信号从一个路由器到租用线路.
B.一CSU / DSU的转换成模拟信号从一个路由器到电话线；一个调制解调器将数字信号从一个路由器到租用线路.
C.一CSU / DSU的转换数字信号从一个路由器到电话线；一个调制解调器转换成模拟信号从一个路由器到电话线.
D.一CSU / DSU的转换数字信号从一个路由器到租用线路；调制解调器将数字信号从一个路由器到电话线.

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