The equation of the director circle of the hyperbola $\frac{x^2}{16} - \frac{y^2}{4} = 1$ is given by

  • A
    $x^2 + y^2 = 16$
  • B
    $x^2 + y^2 = 4$
  • C
    $x^2 + y^2 = 20$
  • D
    $x^2 + y^2 = 12$

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