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The locus of the midpoints of the chords...

The locus of the midpoints of the chords of the circle `x^2 +y^2+2x-2y-2=0` which makes an angle of `90^@` at the centre is

A

1) `x^2+y^2-2x-2y=0`

B

2) `x^2+y^2-2x+2y=0`

C

3) `x^2+y^2+2x-2y=0`

D

4) `x^2+y^2+2x-2y-1=0`

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