$\int_0^{\pi /4} \sec x \log (\sec x + \tan x) \, dx = $

  • A
    $\frac{1}{2} [\log (1 + \sqrt{2})]^2$
  • B
    $[\log (1 + \sqrt{2})]^2$
  • C
    $\frac{1}{2} [\log (\sqrt{2} - 1)]^3$
  • D
    $\frac{1}{2} [\log (\sqrt{2} - 1)]^2$

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