यदि $x = \operatorname{sech}^{-1} \frac{1}{2} + \tanh^{-1} \frac{1}{2}$ है,तो $\cosh x =$

  • A
    $\frac{5 \sqrt{3} + 4}{3}$
  • B
    $\frac{2 \sqrt{3} + 3}{2}$
  • C
    $\frac{4 \sqrt{3} + 3}{3}$
  • D
    $\frac{4 \sqrt{3} - 3}{3}$

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