If a --> B and B --> a Are Existing

question 90

Multiple Choice

If A --> B and B --> A are existing functional dependencies,which of the following are NOT equivalent functional dependencies?

• A)A --> B and B --> A
• B)A --> B,X and B --> A,X
• C)X --> A and A --> B
• D)X,A --> B,X and X,B --> A,X

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