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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