A solid sphere of radius R and density `rho` is attached to one end of a mass-less spring of force constant k. The other end of the spring is connected to another solid sphere of radius R and density `3rho`. The complete arrangement is placed in a liquid of density `2rho` and is allowed to reach equilibrium. The correct statements(s) is (are)

Options

A. The net elongation of the spring is `4 pi R^3 pg / 3k`
B. The net elongation of the spring is `8 pi R^3 pg / 3k`
C. The light sphere is partially submerged.
D. The light sphere is completely submerged.