Which is NOT a way to prove a quadrilateral is a parallelogram. a) Prove the diagonals bisect each other. b) Prove both pairs of opposite sides are congruent. c) Prove both pairs of opposite angles are congruent. d) Prove one pair of opposite sides are parallel. Which of the following information would prove the quadrilateral ABCD is a rectangle? a) Slope of AB = 2, Slope of BC = -1/2, Slope of CD = 2, and slope of of DA = -1/2 b) The length of segment AB and CD is 5 units and length of segment BC and DA is 12 c) Slope of AB = 2, Slope of BC = -3/2, Slope of CD = 2, and slope of of DA = -3/2 d) Slope of AB = 2, slope of CD = 2, and the length of segment AB and CD is 5.