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Category A Verified protection. The highest level of security.
Category B Mandatory protection.
Category C Discretionary protection.
Category D Minimal protection. Reserved for systems that have been
evaluated but do not meet requirements to belong to any other
category.
The list that follows includes brief discussions of categories A through
C, along with numeric suffixes that represent any applicable
subcategories (Figure 8.6).
FIGURE 8.6 The levels of TCSEC
