TTL, DTL and ECL which are frequently used to refer to certain “families” of digital integrated circuits, are actually names of ___

TTL, DTL and ECL which are frequently used to refer to certain “families” of digital integrated circuits, are actually names of

A. alternatives to positive and negative logic
B. varieties of positive and negative logic
C. companies that originated the families
D. general varieties of electronic circuits used as logic gates, from which, in essence, the building blocks in each series are constructed.

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Answer: D

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