Which objects and subjects have a label in a MAC model?

A、ObjectsandsubjectsthatareclassifiedasConfidential,Secret,orTopSecrethavealabel.
B、Allobjectshavealabel,andallsubjectshaveacompartment.
C、Allobjectsandsubjectshavealabel.
D、Allsubjectshavealabelandallobjectshaveacompartment.