In a solid sphere two small symmetrical cavities

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A solid sphere of uniform density and radius 4 units is located with its centre at the origin O of coordinates. Two spheres of equal radii 1 unit with their centres at A 2, 0, 0 and B2, 0, 0 respectively are taken out of the solid leaving behind spherical cavities as shown in figure. Then,

The gravitational force due to this object at the origin is zero

The gravitational force at the point B (2, 0, 0) is zero

The gravitational potential is the same at all points of the circle $y^2+z^2=36$

The gravitational potential is the same at all points of the circle $y^2+z^2=4$

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A solid sphere of uniform density and radius 4 units is located with its centre at the origin O. Two spheres of equal radii 1 unit, with their centres at A 2, 0, 0 and B 2, 0, 0 respectively are taken out of the solid leaving behind spherical cavities as shown in the figure. Then choose the incorrect statement.

The gravitational force due to this object at the origin is zero.

The gravitational force at point B (2, 0, 0) is zero.

The gravitational potential is the same at all points of the circle $y^2+z^2=36$.

The gravitational potential is the same at all points of the circle $y^2+z^2=4$.