Give a geometric description of the following set of points. x^2 + y^2 + z^2 - 16x + 6y-14z + 73 = Select the correct choice below and fill in the answer boxes within your choice. (Simplify your answers.) The exterior of a ball centered at with radius __
a sphere centered at __ __ __ with radius __ a ball centered at __ __ __ with radius __