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Which of the following access control models introduces user security clearance and data classification?
Correct Answer: D
Explanation/Reference: Explanation: Mandatory access control (MAC) is an access policy that restricts access to objects based on the security clearance of a subject and the classification of an object. Incorrect Answers: A: Role-based access control (RBAC) provides access to resources according to the role the user holds within the company or the tasks that the user has been assigned. B: Access in a DAC model is restricted based on the authorization granted to the users. C: Non-discretionary access control is when the system administrator or a single management body within an organization centrally controls access to all resources for everybody on a network. References: Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, pp. 220-228 http://www.answers.com/Q/What_is_Non_discretionary_access_control