单选题What is the difference between a CSU/DSU and a modem?()AA CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased lineBA CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased lineCA CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone lineDA CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line

单选题
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


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