The equation of the parabola whose focus...

The equation of the parabola whose focus is (1,-1) and the directrix is `x+y+7=0` is (a)`x^2+y^2-2x y-18 x-10 y=0` (b)`x^2+y^2-18 x-10 y-45=0` (c)`x^2-18 x-10 y-45=0` (d)`x^2+y^2-2x y-18 x-10 y-45=0`

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