If $a(2+\sqrt{3})=b(2-\sqrt{3})=1,$ then the value of $\frac{1}{a^{2}+1}+\frac{1}{b^{2}+1}$ is

  • A
    $4$
  • B
    $9$
  • C
    $-5$
  • D
    $1$

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