8.4 Using four-valued logic, find A, B, C, D, E, F, G, and H. (no connection)- B 244 Unit 8 8.5 The circuit below was designed to implement the logic equation F= AB'D + BC'D' + 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 incor- rectly 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 con- nected incorrectly or is malfunctioning? Mess of Wires 3. D