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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