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Tangent is drawn at any point `(p ,q)` on the parabola `y^2=4a xdot` Tangents are drawn from any point on this tangant to the circle `x^2+y^2=a^2` , such that the chords of contact pass through a fixed point `(r , s)` . Then `p ,q ,r` and`s` can hold the relation
(a) `r^2q=4p^2s` (b) `r q^2=4p s^2` (c)`r q^2=-4p s^2` (d) `r^2q=-4p^2s`

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