If $x$ is real and $k = \frac{{{x^2} - x + 1}}{{{x^2} + x + 1}},$ then

  • A

    $\frac{1}{3} \le k \le 3$

  • B

    $k \ge 5$

  • C

    $k \le 0$

  • D

    None of these

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