Which of the following statements about polyinstantiation as a means of implementing mandatory access controls in the

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Which of the following statements about polyinstantiation as a means of implementing mandatory access controls in the database subsystem is true?

a. Conditional statements are applied to a single tuple of a relation to determine what data the user can access

b. Different access controls mechanisms are established to handle different clearance levels

c. Multiple tuples of a relation are created to satisfy the security and integrity rules applicable to each clearance level

d. Classification levels are applied to different data items in a tuple rather than the tuple as a whole

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