If the domain of the function $f(x) = x^2 - 6x + 7$ is $(-\infty, \infty)$,then the range of the function is

  • A
    $(-\infty, \infty)$
  • B
    $[-2, \infty)$
  • C
    $(-2, 3)$
  • D
    $(-\infty, -2)$

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