Three equal masses of 2 kg each are placed at the vertices of an equilateral triangle and a mass of 4 kg is placed at the centroid of the triangle which is at a distance of `sqrt2 m` from each of the vertices of the triangle. The force (in newton) acting on the mass of 4 kg is
Options:
(a) 2
(b) `sqrt2`
(c) `1`
(d) zero