Discussion
If four 4 input multiplexers drive a 4 input multiplexer, we get a:
Answer: A
Correct answer: 16 input MUX
Each of the four first-level multiplexers selects one of four inputs, giving sixteen inputs in all, and the final multiplexer chooses among their four outputs. Two select lines are needed at each level, four in total, which is right for \( 2^4 = 16 \) inputs.
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