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Which of the following access control models requires security clearance for subjects?
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: Identity-based access control is a type of DAC system that allows or prevents access based on the identity of the subject. B: 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. C: Access in a DAC model is restricted based on the authorization granted to the users. References: Harris, Shon, All In One CISSP Exam Guide, 6th Edition, McGraw-Hill, 2013, pp. 220-228