Which of the following two points are on a line perpendicular to the line y = ­ minus 1 halfx + 1

Which of the following two points are on a line perpendicular to the line y = ­ x + 1 A. (-4, 6) and (2, 3) B. (5, 8) and (-1, -4) C. (-2, 7) and (1, 1) D. (-2, -4) and (2, -2)