Rewrite each of the following statements using the other conditional forms: (a) If an integer is a multiple of 4, then it is even. (b) The fact that a polygon is a square is a sufficient condition that it is a rectangle. (c) If x = 5, then x 2 = 25. (d) If x 2 − 5x + 6 = 0, then x = 2 or x = 3. (e) x 2 = y 2 is a necessary condition for x = y.