5. Simplify the following Boolean function F, together with the don't-care conditions d, and then express the simplified function in sum-of-minterms form: (a) F(A, B,C,D)= (4, 5, 7, 12, 13, 14), d=(1,9,11,15); (b) F(A, B,C,D)=( =(0,2,9). 1,3,8,10, 15), d 6. Draw the multi-level NAND circuit for the following expression: w(x+y+ z) +ryz