Show that ABCD is a parallelogram if the four vertices are A(4,5), B(1,-4), C(-3,-3), and D(0,6). (Hint: A parallelogram is a four-sided figure with opposite sides parallel.) What is a way to find whether two opposite sides are parallel? A. Show that their slopes are equal. B. Show that their slopes are negative reciprocals of one another. C. Show that their slopes overlap. D. Show that their slopes are opposite. Find the slopes of sides AB and CD. MAB= McD= (Type integers or simplified fractions.)