單項選擇題

Which of the following are necessary components of a Multi-Level Security Policy?下列哪一項是多級安全策略必需的組件?()

A. Sensitivity Labels for subjects & objects and a "system high" evaluation.對主體和客體實施敏感性標識以及對其進行系統(tǒng)高的評價
B. Security Clearances for subjects & Security Labels for objects and Mandatory Access Control.對主體和客體安全標識的安全許可以及強制訪問控制
C. Sensitivity Labels for only objects and Mandatory Access Control.只針對客體的敏感性標識和強制訪問控制
D. Sensitivity Labels for subjects & objects and Discretionary Access Control.對主體及客體的敏感性表情和自主訪問控制

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