The circuit below was designed to implement the logic

Chapter 8, Problem 8.5

(choose chapter or problem)

The circuit below was designed to implement the logic equation \(F = AB^\prime D + BC^\prime D^\prime  + BCD\), but it is not working properly. The input wires to gates 1, 2, and 3 are so tightly packed, it would take you a while to trace them all back to see whether the inputs are correct. It would be nice to only have to trace whichever one is incorrectly wired. When A = B = 0 and C = D = 1, the inputs and outputs of gate 4 are as shown. Is gate 4 working properly? If so, which of the other gates either is connected incorrectly or is malfunctioning?

                   

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