The equation of a circle which touches the $x$-axis and whose centre is $(1, 2)$ is
- A$(x-2)^2+(y-1)^2=4$
- B$(x-1)^2+(y-2)^2=4$
- C$(x-1)^2+(y+2)^2=4$
- D$(x+2)^2+(y-1)^2=4$
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