根据美国国防部和国家标准局的《可信计算机系统评测标准》（TCSEC）。，可将系统分成4类，共7级。标记安全保护级是（53），该级别对系统的数据进行标记，并对标记的主体和客体实施强制存取控制
- A.C1
- B.C2
- C.B1
- D.B2B1级：标记安全保护级。对系统的数据进行标记，并对标记的主体和客体实施强制存取控制；B2级：结构化安全保护级。建立形式化的安全策略模型，并对系统内的所有主体和客体实施自主访问和强制访问控制；B3级：安全域。能够满足访问监控器的要求，提供系统恢复过程。
正确答案及解析
正确答案
解析
B级：强制式保护级。其安全特点在于由系统强制的安全保护。
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