If the Arithmetic Mean $(AM)$ $= 16$ and the Harmonic Mean $(HM)$ $= \frac{63}{4}$ for any two numbers,what will be the Geometric Mean $(GM)$?

  • A
    $6\sqrt{7}$
  • B
    $\sqrt{7}$
  • C
    $6\sqrt{3}$
  • D
    None of these

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