If $x=\frac{\sqrt{3}+1}{\sqrt{3}-1}$ and $y=\frac{\sqrt{3}-1}{\sqrt{3}+1}$,find the value of $x^{2}+y^{2}$.

  • A
    $7$
  • B
    $9$
  • C
    $14$
  • D
    $49$

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