8 1 mark - Identify the subsystem for the attributes and classes. Identify the subsystem where the classes and attributes of the consolidated domain model class diagram have come from. This could be achieved by colour coding the attributes from each subsystem; for example, black font for the Booking subsystem, blue font for the Accommodation subsystem and red font for the Airbnb Management subsystem. You must clearly indicate which colour is for which subsystem. This will ensure that you have included all classes, relationships and attributes from all subsystems and help you and the markers in checking the consistency of the consolidated domain model class diagram.