The parabolas y2 = 4x and x2 = 4y divide the square region bounded the lines x = 4, y = 4 and the coordinate axes. If S1, S2, S3 are respectively the areas of these parts numbered from top to bottom then S1 : S2 : S3 is.........
(a) 1:2:3
(b) 2:1:2
(c) 3:2:3
(d) 1:1:1
