$\int_0^{\frac{\pi}{2}} \frac{x \tan x \sec^2 x}{\tan^4 x + 1} dx =$

  • A
    $\frac{\pi^2}{16}$
  • B
    $\frac{\pi^2}{4}$
  • C
    $\frac{\pi^2}{8}$
  • D
    $\frac{\pi^2}{32}$

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