The interval in which the function $f(x) = x^{3} - 6x^{2} + 9x + 10$ is increasing is:

  • A
    $(-\infty, 1] \cup [3, \infty)$
  • B
    $(-\infty, -1] \cup [3, \infty)$
  • C
    $(-\infty, 1) \cup (3, \infty)$
  • D
    $[1, 3]$

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