The parabolas $$y^2 = 4x$$ and $$x^2 = 4y$$ divide the square region bounded by the lines $$x = 4, y = 4$$ and the coordinate axes. If $$S_1, S_2, S_3$$ are respectively the areas of these parts numbered from top to bottom; then $$S_1 : S_2 : S_3$$ is

A

$$1 : 2 : 1$$

B

$$1 : 2 : 3$$

C

$$2 : 1 : 2$$

D

$$1 : 1 : 1$$