The set of real values of $x$ that satisfy the inequality ${\log _{1/2}}({x^2} - 6x + 12) \ge - 2$ is:

  • A
    $\left( - \infty , 2 \right]$
  • B
    $[2, 4]$
  • C
    $[4, + \infty )$
  • D
    None of these

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