Describe the Graph of the Function F(x,y) =

Multiple Choice

Describe the graph of the function f(x,y) = , where a > 0.

A) the sphere of radius a centred at the origin
B) the set of points inside or on the sphere of radius a centred at the origin
C) the points on the sphere of radius a centred at the origin that lie on or above the xy-plane
D) the circle centred at the origin in the xy-plane
E) the points inside or on the sphere of radius a centred at the origin that lie on or above the xy-plane