parabola ques.

Tangent is drawn at any point(p,q) on the parabola y^2=4*a*x,

Tangents are drawn from any point on this tangent to the circle x^2+y^2=a^2, such that all the chords of contact pass through a fixed point ( r,s) then

p,q,r,and s satisfy

A) (r^2) * q=4 * p^2 * s

B) rq^2 = 4*p*s^2

C) r*q^2 = -4* p*s^2

D) a^2 = -p*r

plz. solve or give a clue to eliminate options , this a multi choice so more than one answer may be correct