Find the equation of the director circle of the circle $x^2 + y^2 = 8$.

  • A
    $x^2 + y^2 = 8$
  • B
    $x^2 + y^2 = 16$
  • C
    $x^2 + y^2 = 4$
  • D
    $x^2 + y^2 = 12$

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