Which of the following are the limitations of the Bell-LaPadula model?

A.
No policies for changing access data control.

B.
All of the choices.

C.
Contains covert channels.

D.
Static in nature.

Explanation:
Limitations of the BLP model:
Have no policies for changing access data control
Intended for systems with static security levels
Contains covert channels: a low subject can detect the existence of a high object when it is denied
access. Sometimes it is not enough to hide the content of an object; also their existence may have to
be hidden.
Restricted to confidentiality