What is the simple security property of which one of the following models is described as: A user has
access to a client company’s information, c, if and only if for all other information, o, that the user
can read, either x(c) z (o) or x(c) = x (o), where x(c) is the client’s company and z (o) is the
competitors of x(c).

A.
Bell-LaPadula

B.
Lattice

C.
Chinese wall

D.
Biba

Explanation:
This model, (D.c. Brewer and M.j. Nash, Chinese Wall Model, Proceedings of the 1989 IEEE Computer
Society Symposium on Security and Privacy, 1989), defines rules that prevent conflicts of interest in
organizations that may have access to information from companies that are competitors of each
other. Essentially, the model states that a user working on one account cannot work on a
competitor’s account for a designated period of time. Answer the Biba model is an integrity model
that is an analog of the Bell-LaPadula confidentiality model of answer Bell-LaPadula. Answer the
lattice refers to the general information flow model where security levels are represented by a
lattice structure. The model defines a transitive ordering relation, , on security classes. Thus, for
security classes X, Y, and Z, the ordering relation X Y Z describes the situation where Z is the highest
security class and X is the lowest security class, and there is an ordering among the three classes.