What is the domain of f(x)=x2−5x+6f(x) = \sqrt{x^2 - 5x + 6}f(x)=x2−5x+6?
(2,3)(2, 3)(2,3)
(−∞,2]∪[3,∞)(-\infty, 2] \cup [3, \infty)(−∞,2]∪[3,∞)
[2,3][2, 3][2,3]
(−∞,2)∪(3,∞)(-\infty, 2) \cup (3, \infty)(−∞,2)∪(3,∞)