In IR 7316, which aspects of access control mechanisms are discussed?

• A. Capabilities
• B. Limitations
• C. Qualities
• D. All of the above

Answer: (D)

Access control mechanisms are evaluated across multiple dimensions: what they can enforce (capabilities), where they may fall short (limitations), and the desirable properties they should have (qualities). In IR 7316, all of these aspects are discussed, so the option that includes capabilities, limitations, and qualities is the best choice. Understanding capabilities shows what actions the system permits; recognizing limitations highlights potential weaknesses and tradeoffs; considering qualities points to attributes like reliability, auditability, and scalability. Since IR 7316 covers each of these areas, the answer that encompasses all of them is correct.