A sizeable geographical area with communication based on the telephone

1.	A sizeable geographical area with communication based on the telephone system is though as
A.	Local area network
B.	Wide area network
C.	Modulator-Demodulator
D.	All of the above
E.	None of the above
Answer» C. Modulator-Demodulator

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A sizeable geographical area with communication based on the telephone system is though as

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