From a circle of radius 12cm centered at O, a sector OAB of arc length 8π cm is cut and from it a cone is formed by joining OA and OB. If the volume of the cone is V cubic cm and its lateral surface area is S square cm, then V : S =
1
4√2 ∶ 3
2
9√2 ∶ 8
3
8√2 ∶ 9
4
3√2 ∶ 8