The slopes of the focal chords of the parabola $y^2=32x$,which are tangents to the circle $x^2+y^2=4$,are

  • A
    $\frac{1}{2}, -\frac{1}{2}$
  • B
    $\frac{1}{\sqrt{3}}, -\frac{1}{\sqrt{3}}$
  • C
    $\frac{1}{\sqrt{15}}, -\frac{1}{\sqrt{15}}$
  • D
    $\frac{2}{\sqrt{5}}, -\frac{2}{\sqrt{5}}$

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