Explanation: The take-grant protection model is a formal model used in the field of computer security to establish or disprove the safety of a given computer system that follows specific rules. It shows that for specific systems the question of safety is decidable in linear time, which is in general undecidable. The model represents a system as directed graph, where vertices are either subjects or objects. The edges between them are labeled and the label indicates the rights that the source of the edge has over the destination. Two rights occur in every instance of the model: take and grant. They play a special role in the graph rewriting rules describing admissible changes of the graph. Answer: D is incorrect. The access matrix is a straightforward approach that provides access rights to subjects for objects. Answer: C is incorrect. The Bell-LaPadula model deals only with the confidentiality of classified material. It does not address integrity or availability. Answer: B is incorrect. The integrity model was developed as an analog to the Bell-LaPadula confidentiality model and then became more sophisticated to address additional integrity requirements.