A boy of mass M is applying a horizontal...

A boy of mass M is applying a horizontal force to slide a box of mass `M_(1)` on rough horizontal surface. The coefficient of friction between the shoe of the boy and the floor is `mu` and that between the box and the floor is ‘`mu_(1)`’ In which of the following cases is it certainly not possible to slide the box ?

`multmu_(1), M ltM_(1)`

`mugt mu_(3), M gt M_(1)`

`mu lt mu_(1), M gt M_(1)`

`mu gt mu_(1), M lt M_(1)`

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