Circular and Satellite Motion - Mission CG8 Detailed Help

The elliptical path of an orbiting satellite is shown below. Several locations along the path are labeled with letters. Rank these locations in increasing order of net force, beginning with the location of lowest net force. List the letters in increasing order with no spaces or commas between letters. If the net force is the same at all location, simply enter 'Z' into the answer box.

 
Definition of a Satellite:
A satellite is an object that is orbiting some central body as a result of the sole influence of the gravitational attraction towards that body's mass.

 
A satellite is an object that is under the sole influence of gravity. The net force on a satellite is simply the gravitational force with which it is attracted to the object it orbits. The force of gravity is inversely proportional to the square of the distance of separation between the satellite and the central body. The further away the satellite moves from the central body (the object at the center of the orbit), the smaller the gravitational force becomes. Answering this question correctly involves a careful comparison of the separation distance for each of the given locations.