If the angle between the asymptotes of the hyperbola $\frac{x^2}{a^2} - \frac{y^2}{3} = 4$ is $\frac{\pi}{3}$,then its conjugate hyperbola is:

  • A
    $\frac{y^2}{12} - \frac{x^2}{36} = 1$
  • B
    $\frac{y^2}{12} - \frac{x^2}{25} = 1$
  • C
    $\frac{y^2}{36} - \frac{x^2}{12} = 1$
  • D
    $\frac{y^2}{12} - \frac{x^2}{4} = 1$

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