The reason why integrated circuits are divided into digital linear categories is because ___

The reason why integrated circuits are divided into digital linear categories is because

A. They either process analog or digital signals
B. They are either used as input of output components
C. Up to the present these are the only two known categories
D. They are simply circuits that happen to be constructed integrally and like all circuits are either switching type or amplifying type

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Answer: D

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