If x^2+y^2-2x+2a y+a+3=0 represents the ...

If `x^2+y^2-2x+2a y+a+3=0` represents the real circle with nonzero radius, then find the values of `a`.

A

`ain(-oo,-1)`

B

`ain(-1,2)`

C

`ain(2,oo)`

D

`ain(-oo,-1)uu(2,oo)`

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The correct Answer is:

D

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