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The equation of the ellipse whose focus ...

The equation of the ellipse whose focus is `(1,-1)` the directrix the line `x-y-3=0` and eccentricity `(1)/(2)` is

A

`7 x^(2)+2 x y+7 y^(2)-10 x+10 y+7=0`

B

`7 x^(2)+2 x y+7 y^(2)+7=0`

C

`7 x^(2)+2 x y+7 y^(2)+10 x-10 y-7=0`

D

none

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The correct Answer is:
A
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