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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