10 a.) Construct the lattice of security labels for the multilateral security model. There are 3 security levels public, confidential, and strictly confidential, and 3 compartments ADMIN, LECTURERS, and STUDENTS. The lattice contains all possible combinations of security level and compartment, and use arrows to indicate hierarchy of the security.

b). In the above model, which objects are visible to a subject with security label (confidential,{STUDENTS}) in a need-to-know policy?