For the function $f(x) = x^4 (12 \ln x - 7)$,which of the following statements is true?

  • A
    The point $(1, -7)$ is the point of inflection.
  • B
    $x = e^{1/3}$ is the point of minima.
  • C
    The graph is concave downwards in $(0, 1)$.
  • D
    All of the above.

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