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
)