Given the function $f(x) = 2x \sqrt{x^3 - 1} + 5 \sqrt{x} \sqrt{1 - x^4} + 7x^2 \sqrt{x - 1} + 3x + 2$,then:

  • A
    the function is continuous but not differentiable at $x = 1$
  • B
    the function is discontinuous at $x = 1$
  • C
    the function is both continuous and differentiable at $x = 1$
  • D
    the range of $f(x)$ is $R^+$

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