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If the equation aabsz^2+bar(baralphaz+al...

If the equation `aabsz^2+bar(baralphaz+alphabarz)+d=0` represents a circle where a, d are real constants, then which of the following condition is correct ?

A

`absalpha^2-adgt0and a inR-{0}`

B

`absalpha^2-ad ne 0`

C

`absalpha^2-adge0and a inR`

D

`alpha=0,a,d in R^(+)`

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