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The equation of the director circle of t...

The equation of the director circle of the hyperbola `(x^2)/(16)-(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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