Which rule yields the dilation of the figure qrst centered at the origin? a) (x, y) → (3x, 3y) b) (x, y) → ( 1 3 x, 1 3 y) c) (x, y) → (x + 3, y + 3) d) (x, y) → (x + 1 3 , y + 1 3 )