If the angle between the curves $y = a^x$ and $y = b^x$ is $\alpha$,find the modulus of $\tan \alpha$.

  • A
    $\frac{a - b}{1 + ab}$
  • B
    $\frac{\log a + \log b}{1 - \log a \log b}$
  • C
    $\frac{a + b}{1 - ab}$
  • D
    $\frac{\log a - \log b}{1 + \log a \log b}$

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