The function $f(x) = \frac{\log(1 + ax) - \log(1 - bx)}{x}$ is not defined at $x = 0$. The value which should be assigned to $f$ at $x = 0$ so that it is continuous at $x = 0$ is:

  • A
    $a - b$
  • B
    $a + b$
  • C
    $\log a + \log b$
  • D
    $\log a - \log b$

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