The ratio of the volumes of two right circular cylinders A and B is x/y and the ratio of their heights is a : b. What is the ratio of the radii of A and B?
1
\(\sqrt {\frac{{xb}}{{ya}}}\)
2
\(\frac{{xb}}{{ya}}\)
3
\(\sqrt {\frac{{xa}}{{yb}}}\)
4
\(\frac{{yb}}{{xa}}\)