Question ATPL - Airline Transport Pilot license - Mass and Balance

In calculations with respect to the position of the centre of gravity a reference is made to a datum. The datum is - ATPL

A reference plane which is chosen by the aircraft manufacturer. Its position is given in the aircraft Flight or Loading Manual.

Calculated from the data derived from the weighing procedure carried out on the aircraft after any major modification.

An arbitrary reference chosen by the pilot which can be located anywhere on the aircraft.

Calculated from the loading manifest.