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

  • A

    $\left( { - \infty ,\,2} \right]$

  • B

    $[2,\,4]$

  • C

    $\left[ {4, + \infty } \right)$

  • D

    None of these

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