The foci of hyperbola $ 4 x^{2}-9 y^{2}-1=0 $ are
- A$ ( \pm \sqrt{13}, 0) $
- B$ \left( \pm \frac{\sqrt{13}}{6}, 0\right) $
- C$ \left(0, \pm \frac{\sqrt{3}}{6}\right) $
- DNone of these
✓ Correct answer: B
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