यदि $\int \frac{x}{x \tan x+1} \, dx = \log f(x) + k$ है,तो $f\left(\frac{\pi}{4}\right) =$

  • A
    $\frac{\pi}{4 \sqrt{2}}$
  • B
    $\pi + \frac{\pi}{2 \sqrt{2}}$
  • C
    $\frac{\pi + 4}{4 \sqrt{2}}$
  • D
    $\frac{\pi - 4}{4 \sqrt{2}}$

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