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A block of mass \( m \) is pulled along a horizontal surface by applying a force at an angle \( \theta \) with the horizontal. If the block travels with a uniform velocity and has a displacement \( d \) and the coefficient of friction is \( \mu \), then the work done by the applied force is
(a) \( \frac{\mu m g d}{\cos \theta+\mu \sin \theta} \)
(b) \( \frac{\mu m g d \cos \theta}{\cos \theta+\mu \sin \theta} \)
(c) \( \frac{\mu m g d \sin \theta}{\cos \theta+\mu \sin \theta} \)
(d) \( \frac{\mu m g d \cos \theta}{\cos \theta-\mu \sin \theta} \)
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