Four spheres of diameter 2a and mass M are placed with their centres on the four corners of a square of side b. Then moment of inertia of the system about an axis about one of the sides of the square is :-

Four sphere of diameter 2a. And mass M are placed with their centres on the four corners of a square of side b. then the moment of inertia of the system about an axis along one of the sides of the square is

Four spheres each of diameter 2a and mass M are placed with their centres at the four corners of a square of side b. Then the moment of inertia of the system about an axis along one of the sides of the square is

Four spheres each diameter 2a and mass 'm' are placed with their centres on the four corners of a square of the side b. Calculate the moment of inertia of the system about any side of the square.