For $a > 0$,if the function $f(x) = 2x^3 - 9ax^2 + 12a^2x + 1$ attains its maximum value at $p$ and minimum value at $q$ such that $p^2 = q$,then $a =$

  • A
    $1/2$
  • B
    $1$
  • C
    $2$
  • D
    $4$

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