यदि $\operatorname{Tan}^{-1} \frac{1}{3}+\operatorname{Tan}^{-1} \frac{1}{7}+\operatorname{Tan}^{-1} \frac{1}{13}+\ldots+\operatorname{Tan}^{-1} \frac{1}{n^2+n+1}=\operatorname{Tan}^{-1} \theta$ है,तो $\theta=$

  • A
    $\frac{n}{n+2}$
  • B
    $\frac{n}{n+1}$
  • C
    $\frac{n+1}{n+2}$
  • D
    $\frac{n-1}{n+2}$

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