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.