Find the definite integral of $\int_{a}^{b} \frac{1}{x} dx$.

  • A
    $\log_{e} \left( \frac{b}{a} \right)$
  • B
    $\log_{e} \left( \frac{a}{b} \right)$
  • C
    $\log_{e} a$
  • D
    $\log_{e} b$

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