x ^(2) + y^(2) + (2K -1) xy -2x + 4y + 3...

`x ^(2) + y^(2) + (2K -1) xy -2x + 4y + 3=0` represents the equation of a circle, find k and radius of the circle ?

A

`-2,sqrt2`

B

`1/2,sqrt2`

C

`-2,sqrt3`

D

`2,sqrt3`

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