For some constants $a$ and $b$,find the derivative of $(ax^2 + b)^2$.

  • A
    $4ax(ax^2 + b)$
  • B
    $2ax(ax^2 + b)$
  • C
    $4ax^2(ax^2 + b)$
  • D
    $ax(ax^2 + b)$

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