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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