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

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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.

Answer: D

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