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Tangent is drawn at any point `(x_1, y_1)` other than the vertex on the parabola `y^2=4a x` . If 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 `(x_2,y_2),` then (a) `x_1, a ,x_2` in GP (b) `(y_1)/2,a ,y_2` are in GP
(c)`-4,(y_1)/(y_2),x_1/x_2` are in GP (d) `x_1x_2+y_1y_2=a^2`

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