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Refer back to the previous question. The VMS scheme is often referred to as a ring protection structure as shown in the figure below. Researchers

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Refer back to the previous question. The VMS scheme is often referred to as a ring protection structure as shown in the figure below. Researchers have pointed out a problem with this approach: "The main disadvantage of the ring (hierarchical) structure is that it does not allow us to enforce he need-to-know principle. In particular, if an object must be accessible in domain D,, but not accessible in domain D, then we must have j

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