The ratio of the volume of two cylinders is 7 : 3 and the ratio of their heights is 7 : 9. If the area of the base of the second cylinder is 154 sq.cm, then what will be the radius (in cm) of the first cylinder?1). $6\sqrt{2}$2). $6\sqrt{3}$3). $7\sqrt{2}$4). $7\sqrt{3}$