Find the equation of the circle with centre $(0,2)$ and radius $2$.
- A$x^{2}+y^{2}-4y=0$
- B$x^{2}+y^{2}-4y+4=0$
- C$x^{2}+y^{2}+4y=0$
- D$x^{2}+y^{2}+4y+4=0$
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