A particle free to move along \( x \)-axis is acted upon by a force \( F=-a x+b x^{2} \) where \...

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A particle free to move along \( x \)-axis is acted upon by a force \( F=-a x+b x^{2} \) where \( a \) and \( b \) are positive constants. For \( x \geq 0 \), the correct variation of potential energy function \( U(x) \) is best represented by
(a)
(b)
\( (c) \)
(d)
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