Discussion
Which of the following type is at lowest level in terms of operating system security ?
Answer: D
The lowest level is Type D.
The US Department of Defense's Trusted Computer System Evaluation Criteria (the Orange Book) grade systems in divisions A, B, C and D. Division D, minimal protection, is for systems that were evaluated but failed the higher requirements.
Security increases from D through C (discretionary protection) and B (mandatory protection) to A (verified protection), the highest level.
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