( 5 )下列不属于非平凡函数依赖的是
A. ) ( CustomerID,ProviderID,BuyDate ) → GoodsName
B. (CustomerID,ProviderID,BuyDate) → GoodsName,ProviderID
C. ) ( CustomerID,ProviderID,BuyDate ) → GoodsClassID
D. ) ( CustomerID,ProviderID,BuyDate ) → ProviderID
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