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A block of mass \( m \) lying on a rough horizontal plane is acted upon by a horizontal force \( P \) and another force \( Q \) inclined at an angle \( \theta \) to the vertical. The block will remain in equilibrium, if the coefficient of friction between it and the surface is
(a) \( \frac{(P+Q \sin \theta)}{(m g+Q \cos \theta)} \)
(b) \( \frac{(P \cos \theta+Q)}{(m g-Q \sin \theta)} \)
(c) \( \frac{(P+Q \cos \theta)}{(m g+Q \sin \theta)} \)
(d) \( \frac{(P \sin \theta-Q)}{(m g-Q \cos \theta)} \)
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