MCQ Practice Question
In a multiplexer tree, two stages of 4-to-1 multiplexers can be arranged to select among how many data inputs when the second stage selects among four first-stage outputs?
Correct Answer: C. 16
Explanation: Four first-stage 4-to-1 multiplexers select from 16 total inputs, and a second-stage 4-to-1 multiplexer selects one of their four outputs.
Reference: Standard digital electronics: multiplexer expansion