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单项选择题What is the difference between a CSU/DSU and a modem?（）

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.

  • D

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