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[主观题]
关系模式R(A, B, C, D, E, F, G),给定函数依赖集合{A→B, A→C, C→D, C→E, E→FG}, 则R的一个满足3NF的既保持函数依赖又具有无损连接的分解是()。
A、={R1(A, B, C),R2(C, D, E),R3(E, F, G)}
B、={R1(A, B, C, D, E),R2(E, F, G)}
C、={R1(A, B, C),R2(C, D, E, F, G)}
D、={R1(B, C, F, G),R2(A, D, E)}
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