If $\log_x a, a^{x/2}$ and $\log_b x$ are in $G.P.$,then $x = $

  • A
    $-\log(\log_b a)$
  • B
    $-\log_a(\log_a b)$
  • C
    $\log_a(\log_e a) - \log_a(\log_e b)$
  • D
    $\log_a(\log_e b) - \log_a(\log_e a)$

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