A、A system where all users are cleared to view the most highly classified data on the system.系统上的所有用户被许可查看最高级别的数据

B、A system that contains only data of one security classification.只包含一个安全级别的数据

C、A system with data that contains only data of the highest security classification.只包含最高安全级别的数据

D、A system that uses a Multi-Level Security Policy to separate the highly classified data from the other data residing on the system.使用多级安全策略去划分高级别数据和其他数据。