The Bell-LaPadula model addresses which one of the following items?

A.
Covert channels

B.
Definition of a secure state transition

C.
Information flow from high to low

D.
The creation and destruction of subjects and objects

Explanation:
Information flow from high to low is addressed by the * -property of the BellÖLaPadula model,
which states that a subject cannot write data from a higher level of classification to a lower level of
classification. This property is also known as the confinement property or the no write down
property. * In answer “Covert channels”, covert channels are not addressed by the model. The BellLaPadula model deals with information flow through normal channels and does not address the
covert passing of information through unintended paths. The creation and destruction of subjects
and objects, answer “The creation and destruction of subjects and objects”, is not addressed by the
model. * Answer “Definition of a secure state transition” refers to the fact that the model discusses a
secure transition from one secure state to another, but it never provides a definition of a secure
transition.