Describe the given set with a single equation or with a pair of equations. The circle of radius $7$ centered at $(0,2,0)$ and lying in

a$.$ the xy$-$plane

b$.$ the $yz-$plane

c$.$ the plane $y=2$

a$.$ Choose the correct set of points lying in the xy$-$plane.

A$.x^2{y}^2{z}^2=49,z=0$

B$.(x-2{)}^2{y}^2=49,z=0$

C$.x^2(y-2{)}^2=49,z=0$

D$.x^2{y}^2=49,z=0$