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If tangents P Qa n dP R are drawn from a...

If tangents `P Qa n dP R` are drawn from a point on the circle `x^2+y^2=25` to the ellipse `(x^2)/4+(y^2)/(b^2)=1,(b<4),` so that the fourth vertex `S` of parallelogram `P Q R S` lies on the circumcircle of triangle `P Q R` , then the eccentricity of the ellipse is `(sqrt(5))/4` (b) `(sqrt(7))/4` (c) `(sqrt(7))/4` (d) `(sqrt(5))/3`

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