6. For each of the following, find the disjunctive normal form of the function and draw the combinatorial circuit corresponding to the disjunctive normal form. x y z f ( x, y, z) V Z f ( x, y, z) 1 x y f (x, y) 0 0 0 (a) 0 (b) 1 (c) HOODOO O H OOO HO H HC OHOHO OOHHO OHOHO