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Consider the following relation r. Please answer the following questions: (1) One attribute can serve as the primary key of this relation, what is it?

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Consider the following relation r. Please answer the following questions: (1) One attribute can serve as the primary key of this relation, what is it? (2) Which of the following functional dependencies holds in r? a. c rightarrow A Yes ___________ No _________ b. D rightarrow B Yes ___________ No _________ c. A rightarrow B Yes ___________ No _________

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