The sum of all real values of $x$ satisfying the equation ${\left( {{x^2} - 5x + 5} \right)^{{x^2} + 4x - 60}} = 1$ is ;

  • [JEE MAIN 2016]
  • A

    $6$

  • B

    $5$

  • C

    $3$

  • D

    $-4$

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