The domain of the function $f:\mathbb{R} \to \mathbb{R}$ defined by $f(x) = \sqrt{x^2 - 7x + 12}$.

Question

$(-\infty, 3] \cup [4, \infty)$

$(-\infty, 3] \cup (4, \infty)$

$(-\infty, 3] \cap [4, \infty)$

$(3, 4)$

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