The equationof the circle which touches ...

The equationof the circle which touches X-axis and whose centre is `(1,2)` is

A

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

B

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

C

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

D

`x^2+y^2+4x+2y+4=0`

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