The points on the line x=2 from which t...

The points on the line `x=2` from which the tangents drawn to the circle `x^2+y^2=16` are at right angles is (are) (a)`(2,2sqrt(7))` (b) `(2,2sqrt(5))` (c)`(2,-2sqrt(7))` (d) `(2,-2sqrt(5))`

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