If $\log_e \left( \frac{a + b}{2} \right) = \frac{1}{2}(\log_e a + \log_e b)$,then the relation between $a$ and $b$ is:

  • A
    $a = b$
  • B
    $a = \frac{b}{2}$
  • C
    $a = 2b$
  • D
    $a = \frac{b}{3}$

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