Which of the following is an equations of a circle in the $xy$ plane with center(0,3) and a radius of 6 units ?

Question

$\begin{array}{1 1} (a)\;x^2+(y+3)^2=36 \\ (b)\;x^2-(y-3)^2=36 \\ (c)\;x^2+(y-3)^2=36 \\(d)\;x^2-(y-3)^2=36 \end{array} $