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5. Refer to the ERD which follows to answer these questions. Sa: How many entities are shown? 5b: How many attributes are shown? Even though

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5. Refer to the ERD which follows to answer these questions. Sa: How many entities are shown? 5b: How many attributes are shown? Even though they are not labeled, it is possible to determine at least one primary key and one foreign key. 5c: What is it and explain how you know

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