A polygon is graphed on a coordinate grid with (x, y) representing the location of a certain point on the polygon. The polygon is transformed using the rule (x, y) → (ax, ay). Which statement must be true? A) If a is greater than 1, the image of the polygon is congruent to the polygon. B) If a is between 0 and 1, the image of the polygon is congruent to the polygon. C) If a is greater than 1, the image of the polygon is smaller than the polygon. D) If a is between 0 and 1, the image of the polygon is smaller than the polygon.