$\lim _{x \rightarrow 1} \frac{a b^x-a^x b}{x^2-1} = $

  • A
    $\frac{-ab}{2} \log \left(\frac{b}{a}\right)$
  • B
    $\frac{ab}{2} \log \left(\frac{b}{a}\right)$
  • C
    $a b \log \left(\frac{b}{a}\right)$
  • D
    $-a b \log \left(\frac{b}{a}\right)$

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