A cubical box of side length L rests on ...

A cubical box of side length `L` rests on a rough horizontal surface having coefficient of friction `mu`. A variable horizontal force `F=alpha t` is applied on the top of the block as shown in figure, where `alpha` is a constant and `t` is time. The coefficient of friction is sufficient so that the block does not slide before toppling. The graph between torque due to normal reaction about end `B` and time before toppling start is

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