The points A(-3,4), B(3,2), C(1,-4) , and D(-5,-2) form quadrilateral 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 diagonals have different lengths.
C. The diagonals have the same lengths.
D. The product of the slopes of the diagonals is −1.