यदि $\operatorname{sech}^{-1} x + \operatorname{cosech}^{-1} x$ का परिसर $[a, b]$ है,तो

  • A
    $a=0, b=1$
  • B
    $a=\sqrt{2}, b=\infty$
  • C
    $a=\log (1+\sqrt{2}), b=\infty$
  • D
    $a=0, b=\log (1+\sqrt{2})$

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