Which property is true for the directrices of the hyperbola x2a2−y2b2=1\frac{x^2}{a^2} - \frac{y^2}{b^2} = 1a2x2−b2y2=1?
They are parallel to the conjugate axis.
They pass through the foci.
They intersect the transverse axis at x=±ex = \pm ex=±e.
They are perpendicular to the transverse axis.