cide whether or not the equation has a circle as its graph. If it does, give the center the radius. If it does not, describe the graph. x+y2-8x+4y= -4 elect the correct choice below and, if necessary, fill in the answer boxes to complete your choice. OA. The graph of the equation is a point. OB. The graph of the equation is a line. OC. The graph of the equation is a circle with center The radius of the circle is OD. The graph is nonexistent. (Type an ordered pair.)