The range of values of alpha for which ...

The range of values of `alpha` for which the line `2y=gx+alpha` is a normal to the circle `x^2=y^2+2gx+2gy-2=0` for all values of `g` is (a)`[1,oo)` (b) `[-1,oo)` (c)`(0,1)` (d) `(-oo,1]`

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