$\operatorname{sech}^{-1}\left(\frac{1}{\sqrt{2}}\right)+\operatorname{cosech}^{-1}(-1)=$

  • A
    $0$
  • B
    $\sqrt{2}+1$
  • C
    $\sqrt{2}$
  • D
    $\sqrt{2}-1$

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