The upper half of an inclined plane with inclination \( \theta \) is perfectly smooth while the ...

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The upper half of an inclined plane with inclination \( \theta \) is perfectly smooth while the lower half is rough. A body starting from rest at the top will again come to rest at the bottom if the coefficient of friction for the lower half given - by
\( -(a) \tan \theta \)
(b) \( 2 \tan \theta \)
(c) \( 2 \cos \theta \)
(d) \( 2 \sin \theta \)
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