DQuestion 5 Mandatory access control (MAC) schemes a) Implement multi-level relational schema designs C b) Operate using fixed (pre-defined) access rules O Provide different views to different user sensitivity levels O d) None of the above O e) All of the above D Question 6 Discretionary access control (DAC) a) Allows a creator/owner of a resource to revoke privileges for all users O b) Provides a very robust access framework for confidential databases c) Allows users to control access privileges d) All of the above