If $\alpha$ and $\beta$ are the roots of the quadratic equation $ax^{2} + bx + c = 0$,then the value of $\frac{\alpha}{\beta} + \frac{\beta}{\alpha}$ is

  • A
    $\frac{b^{2} - 2ac}{ac}$
  • B
    $\frac{b^{2} - 2ac}{2ac}$
  • C
    $\frac{b^{2} - ac}{2ac}$
  • D
    $\frac{b^{2} + 2ac}{ac}$

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