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A. The number of classification in the two labels is different.
B. Neither label contains all the classifications of the other.
C. the number of categories in the two labels are different.
D. Neither label contains all the categories of the other.
Answer(s): D
Explanation:
If a category does not exist then you cannot compare it. Incomparable is when you have two
disjointed sensitivity labels, that is a category in one of the labels is not in the other label.
"Because neither label contains all the categories of the other, the labels can't be compared.
They're said to be incomparable"
COMPARABILITY:
The label:
TOP SECRET [VENUS ALPHA]
is "higher" than either of the labels:
SECRET [VENUS ALPHA] TOP SECRET [VENUS]
But you can't real y say that the label:
TOP SECRET [VENUS]
is higher than the label:
SECRET [ALPHA]
Because neither label contains all the categories of the other, the labels can't be compared.
They're said to be incomparable. In a mandatory access control system, you won't be allowed
access to a file whose label is incomparable to your clearance.
The Multilevel Security policy uses an ordering relationship between labels known as the
dominance relationship. Intuitively, we think of a label that dominates another as being "higher"
than the other. Similarly, we think of a label that is dominated by another as being "lower" than
the other. The dominance relationship is used to determine permitted operations and
information flows.
DOMINANCE
The dominance relationship is determined by the ordering of the Sensitivity/Clearance
component of the label and the intersection of the set of Compartments.
Sample Sensitivity/Clearance ordering are:
Top Secret > Secret > Confidential > Unclassified
s3 > s2 > s1 > s0
Formally, for label one to dominate label 2 both of the following must be true:
The sensitivity/clearance of label one must be greater than or equal to the sensitivity/clearance
of label two.
The intersection of the compartments of label one and label two must equal the compartments
of label two.
Additionally:
Two labels are said to be equal if their sensitivity/clearance and set of compartments are exactly
equal. Note that dominance includes equality.
One label is said to strictly dominate the other if it dominates the other but is not equal to the
other. Two labels are said to be incomparable if each label has at least one compartment that is
not included in the other's set of compartments.
The dominance relationship wil produce a partial ordering over all possible MLS labels,
resulting in what is known as the MLS Security Lattice.
The following answers are incorrect:
The number of classification in the two labels is different. Is incorrect because the categories
are what is being compared, not the classifications.

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