Which access control model allows permissions based on a lattice structure?

The correct answer is C, and this relates to the way permissions and access rights are structured within a lattice-based approach. The Lattice Model is specifically designed to provide a framework for access control that incorporates different levels of permissions organized hierarchically.

In this model, each subject (such as a user or process) and each object (such as files or databases) is assigned a sensitivity label, which denotes the level of access that is appropriate. The main concept behind the lattice structure is that it allows users to access objects at or below their level of security clearance while preventing access to objects above it. This ensures that information does not flow from a higher security level to a lower one, thereby maintaining confidentiality and integrity.

By incorporating this structured hierarchy and clear definitions of access levels, the Lattice Model offers a robust means of enforcing security policies that require strict adherence to defined permissions based on this lattice concept. The other models referenced have different principles and may not utilize this structured approach to permissions, making the Lattice Model uniquely suited for scenarios where precise security classifications are essential.