વિધેય $f(x) = \lim_{n \to \infty} \frac{x^{2n} - 1}{x^{2n} + 1}$ એ નીચેનામાંથી કયા વિધેયને સમાન છે?

  • A
    $g(x) = \text{sgn}(x - 1)$
  • B
    $h(x) = \text{sgn}(\tan^{-1}x)$
  • C
    $u(x) = \text{sgn}(|x| - 1)$
  • D
    $v(x) = \text{sgn}(\cot^{-1}x)$

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