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6. [5 points] Consider relation R (A, B, C, D, E, F, G) with functional dependencies: AB C CD E EF G FG E DE

6. [5 points] Consider relation R (A, B, C, D, E, F, G) with functional dependencies: AB C CD E EF G FG E DE C, BCA Which one of the following is a key? -A. ACDF B. ABFG C. BDE D. ADFG

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