Which of the following statements could be true if $f''(x) = x^{1/3}$?
$I$. $f'(x) = \frac{3}{4}x^{4/3} + 9$ $II$. $f(x) = \frac{9}{28}x^{7/3} - 2$
$III$. $f(x) = \frac{9}{28}x^{7/3} + 6$ $IV$. $f'(x) = \frac{3}{4}x^{4/3} - 4$

  • A
    $I$ only
  • B
    $III$ only
  • C
    $II$ & $IV$ only
  • D
    $I$ & $IV$ only

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