यदि $\lim _{n}$ ${\rightarrow \infty}\left[\left(1+\frac{1}{n^2}\right)\left(1+\frac{4}{n^2}\right)\left(1+\frac{9}{n^2}\right) \ldots\left(1+\frac{n^2}{n^2}\right)\right]^{\frac{1}{n}}=ae^{b}$ है,तो $a+b=$

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

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