A. 0

B. 2

C. 3

D. 4

If the equation of the pair of tangents drawn from (1, 2) on the ellipse x^{2}+2y^{2}=2 is 3x^{2}-4xy-y^{2}+ax+by+c=0 then the ascending order of a, b, c is

The pole of the line y=x+2 e with respect to the ellipse x^{2}+4y^{2}-2x-6y-10=0 is

The equation of ellipse whose focus is (0, √a^{2}-b^{2}), directrix is y=a^{2}/√a^{2}-b^{2 }and eccentricity is √a^{2}-b^{2}/a is