A. x2/a2+y2/b2=1

B. x2/b2+y2/a2=1

C. x2/a2+y2/b2=2

D. x2/b2+y2/a2=2

I: The locus of poles of chords of the ellipse x^{2}/a^{2}+y^{2}/b^{2}=1 which touch the parabola y^{2}= 4px is p a^{2}y^{2}+b^{4}x=0

II: The locus of poles of chords of the ellipse x^{2}/a^{2}+y^{2}/b^{2}=1 which touch the x^{2}/α^{2}+y^{2}/β^{2}=1 is α^{ 2}x^{2}/a^{4}+β^{2}y^{2}/b^{4}=1

The locus of the middle point of chords of the ellipse x^{2}/a^{2}+y^{2}/b^{2}=1 which are at a constant distance d from the centre of the ellipse is

The locus of midpoint of the chord of the ellipse x^{2}/a^{2}+y^{2}/b^{2}=1 which pass through the fixed point (h, k) is

The equation of the auxiliary circle of x^{2}/12+y^{2}/18=1 is

If the chord of contact of the point (1, -2) with respect to the ellipse 4x^{2}+5y^{2}=20 is ax+by+c=0 then the ascending order of a, b, c is