Which one of the following symbols is not used in an ERD?

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Which one of the following symbols is not used in an ERD?



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2) A supertype/subtype hierarchy has which of the following features?

3) A supertype/subtype hierarchy is which of the following?

4) Which of the following is not one of the three ways to classify an action assertion?

5) When an entity instance may be a member of multiple subtypes or it does not have to be a member of a subtype, it is which of the following?

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