Write the vector equation of line r through point A with direction vector D if OA = A = (3, -1, 2) and D = (-1, 4, 7).
A) r = (3, -1, 2) + t(-1, 4, 7)
B) r = (3, -1, 2) + t(1, -4, -7)
C) r = (3, -1, 2) - t(-1, 4, 7)
D) r = (3, -1, 2) - t(1, -4, -7)