If $\alpha$ and $\beta$ are the roots of the equation $a x^{2}+b x+c=0$,find the value of $\alpha^{2}+\beta^{2}$.

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

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