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7 . Consider the following set F of functional dependencies on the relation schema I ( A , B , C, D , E, F

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7 . Consider the following set F of functional dependencies on the relation schema I ( A , B , C, D , E, F ) : ( 12 points , 3 points each . ) ABCD BCODE BOD DOA a . Compute B+ b. Compute D* . C . Prove ( using Armstrong's axioms ) that AF is a superkey . d. Compute a canonical cover for the above set of functional dependencies F ; give each step of your derivation with an explanation

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