A body is kept on a rough horizontal surface of angle of friction ' $\alpha$ ' and moved by applying a force of magnitude 'F' making angle '$\theta$ ' with horizontal. Arrange the following cases in the order of increasing magnitude for F.

i) F is pulling force and $\theta =\alpha$

ii) F is pulling force and $\theta =0$

iii) F is pulling force and $\alpha =\theta =0$

iv) F is pushing force and $\theta =\alpha$