If \( \alpha, \beta \gamma \) are the roots of the equation \( x^{3}+a x+b=0 \) then value of \(...

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If \( \alpha, \beta \gamma \) are the roots of the equation \( x^{3}+a x+b=0 \) then value of \( \frac{\alpha^{3}+\beta^{3}+\gamma^{3}}{\alpha^{2}+\beta^{2}+\gamma^{2}} \) is equal to:
(a) \( \frac{3 b}{2 a} \)
(b) \( \frac{-3 b}{2 a} \)
(c) \( 3 b \)
(d) \( 2 b \)
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