Which statement about stick force per g is correct? - ATPL

Question id 259 - Principles of Flight - ATPL - Airline Transport Pilot license

The stick force per g increases, when centre of gravity is moved aft.

The stick force per g must have both an upper and lower limit in order to ensure acceptable control characteristics.

If the slope of the Fe-n line becomes negative, generally speaking this is not a problem for control of an aeroplane.

The stick force per g can only be corrected by means of electronic devices (stability augmentation) in case of an unacceptable value.