A body of mass M is kept on a rough horizontal surface (friction coefficient `= mu`). A person is trying to pull the body by applying a horizontal force but the body is not moving. The force by the surface on the body is F where :
A. F = Mg
B. `F = mu Mg`
C. `Mg le F le Mg sqrt(1+mu^(2))`
D. `Mg ge F ge Mg sqrt(1-mu^(2))`
