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Database Management SystemWhat is DAC, MAC, and RBAC models in databases? Compare and contrast these models based on their policy mechanisms, user flexibility, and real-world applicability. Also explain which model is most suited for large enterprise systems and why.20247mComputer NetworksWhich of the following is the multiple access protocol for channel access control? (i) CSMA/CD (ii) CSMA/CA (iii) Both CSMA/CD and CSMA/CA (iv) HDLC20222mDatabase Management SystemWrite short notes on the following: (a) RBAC model20207mDatabase Management SystemExplain the concepts of Authentication, Authorization, and Access Control in database systems. How do these mechanisms work together to ensure database security? Support your answer with real-world examples and discuss how they are implemented in modern DBMS platforms.20247m