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A body of mass m rests on horizontal surface. The coefficient of friction between the body and the surface is $\mu .$ If the mass is pulled by a force $P$ as shown in the figure, the limiting friction between body and surface will be
  • A$\mu mg$
  • B$\mu \,\left[ {mg + \left( {\frac{P}{2}} \right)} \right]$
  • C$\mu \,\left[ {mg - \left( {\frac{P}{2}} \right)} \right]$
  • D$\mu \,\left[ {mg - \left( {\frac{{\sqrt 3 \,P}}{2}} \right)} \right]$
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