Let $f: A \rightarrow B$ be defined as $f(x) = \frac{1}{2} - \tan \left(\frac{\pi x}{2}\right)$ and $g: B \rightarrow C$ be defined as $g(x) = \sqrt{3 + 4x - 4x^2}$. If $A, B, C$ are subsets of $\mathbb{R}$ and $f$ is an onto function, then the range of the function $f(x)$ is:

  • A
    $(-\infty, \infty)$
  • B
    $[0, \infty)$
  • C
    $[-\frac{1}{2}, \frac{3}{2}]$
  • D
    $[-1, 1]$

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