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The points A(-3,4), B(3, 2), C(1,-4), and D(-5,-2) form quadrilateral ABCD in the coordinate plane. What condition verifies that the diagonals are perpendicular?
A. The product of the slopes of the diagonals is -1
B. The product of the slopes of the diagonal is 1
C. The diagonals have the same length
D. The diagonals have different lengths