Consider the function $f: [\frac{1}{2}, 1] \rightarrow \mathbb{R}$ defined by $f(x) = 4\sqrt{2}x^3 - 3\sqrt{2}x - 1$. Consider the following statements:
$(I)$ The curve $y = f(x)$ intersects the $x$-axis exactly at one point.
$(II)$ The curve $y = f(x)$ intersects the $x$-axis at $x = \cos \frac{\pi}{12}$.
Then:

  • A
    Only $(II)$ is correct
  • B
    Both $(I)$ and $(II)$ are incorrect
  • C
    Only $(I)$ is correct
  • D
    Both $(I)$ and $(II)$ are correct

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