Find the range of f(x)=ln(x2−4x+7)f(x) = \ln(x^2 - 4x + 7)f(x)=ln(x2−4x+7).
[ln(3),∞)[\ln(3), \infty)[ln(3),∞)
(−∞,∞)(-\infty, \infty)(−∞,∞)
(0,∞)(0, \infty)(0,∞)
[ln(7),∞)[\ln(7), \infty)[ln(7),∞)