Let z=x+iy be a complex number such that...

Let `z=x+iy` be a complex number such that `|z+i|=2`. Then the locus of z is a circle whose centre and radius are

A

`(0,1),2`

B

`(0,2),2`

C

`(0,-1),2`

D

`(0,-1),sqrt3`

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