A system must validate access rights to all its resources and must not rely on a cached permission matrix. If the access level to a given resource is revoked bu...

A system must validate access rights to all its resources and must not rely on a cached permission matrix. If the access level to a given resource is revoked but is not reflected in the permission matrix, the security is violated
Which term refers to this REST security design principle?

A. economy of mechanism B. complete mediation C. separation of privilege D. least common mechanism