4. Create the function F(A, B, C, D) = ABC' + C'D' + BCD + A'B'D + AB'D' using an 8-to-1 multiplexer and only NOR gates on the front-end. As select

lines, use S₂ = C, S₁ = D, So = A. Use the 8-to-1 multiplexer block you designed in problem #1.