The parabolas $y^2 = 4x$ and $x^2 = 4y$ divide the square region bounded by the lines $x = 4, y = 4$ and the co-ordinate 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 :

Question

( A ) 1 : 2 : 3
( B ) 1 : 2 : 1
( C ) 1 : 1 : 1
( D ) 2 : 1 : 2