Identify the rotation rule on a coordinate plane that verifies that triangle A(2,-1), B(4,1), C(3,3) and triangle A'(-2, 1), B'(-4,-1), C'(-3,-3) are congruent when rotated 180°.
A) (x, y) → (-y, x)
B) (x, y) → (-x, -y)
C) (x, y) → (y, -x)
D) the triangles are not congruent