Which of the following statements are true

A、stick-fixed maneuver point is the CG location where elevator per g is 0;

B、stick-fixed maneuver point is the CG location where control force per g is 0;

C、stick-free maneuver point is the CG location where elevator per g is 0;

D、stick-free maneuver point is the CG location where control per g is 0