यदि $I_n = \int_{\pi / 2}^{\infty} e^{-x} \cos^n x \, dx$ है, तो $\frac{I_{2018}}{I_{2016}} = $

  • A
    $\frac{2018 \times 2019}{(2017)^2+1}$
  • B
    $\frac{2018 \times 2017}{(2018)^2+1}$
  • C
    $\frac{(2018)(2016)}{(2017)^2+1}$
  • D
    $\frac{(2018)(2017)}{(2019)^2+1}$

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