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The squared length of the intercept made...

The squared length of the intercept made by the line `x=h` on the pair of tangents drawn from the origin to the circle `x^2+y^2+2gx+2fy+c=0` is `(4c h^2)/((g^2-c)^2)(g^2+f^2-c)` `(4c h^2)/((f^2-c)^2)(g^2+f^2-c)` `(4c h^2)/((f^2-f^2)^2)(g^2+f^2-c)` (d) none of these

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