_____ is the fastest logic family; it’s used in high-speed applications. A. DTL B. TTL C. ECL D. MOS E. None of the above

The correct answer is C. ECL.

ECL (emitter-coupled logic) is a type of transistor-transistor logic (TTL) that is faster than other types of TTL. It is used in high-speed applications such as computers and telecommunications.

DTL (diode-transistor logic) is a type of logic gate that uses diodes and transistors. It is slower than TTL and ECL.

TTL (transistor-transistor logic) is a type of logic gate that uses transistors. It is faster than DTL but slower than ECL.

MOS (metal-oxide-semiconductor) is a type of semiconductor that is used in integrated circuits. It is slower than TTL and ECL.

None of the above is the correct answer.