If the function $f(x)=2x^{3}-9ax^{2}+12a^{2}x+1$ where $a>0$ attains its maximum and minimum at $p$ and $q$ respectively such that $p^{2}=q$,then $a$ is equal to

  • A
    $2$
  • B
    $\frac{1}{2}$
  • C
    $\frac{1}{4}$
  • D
    $3$

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