3. Minimize the following Boolean functions into sum-of-products form usingК-mapa \text { (a) } F\left(w_{2} x_{2} y, z\right)=\sum(0,1,4,5,8,9,10,15) \text { (b) } F(a, b, c, d)=\sum(1,2,4,5,6,7,9,11,12,14) \text { (c) }
F(w, x, y, z)=\prod(0,1,2,4,5,7,8,10,12,15) \text { (d) } F\left(a_{2} b_{2} c_{2} d\right)=\prod(0,1,3,5,8,11,12,13,14,15)