If a student studies more than one major, the "Major" attribute in the "Student" entity is called: * Multi-valued None of the above Composite Single-valued The relationship between two use cases in the use case diagram can be: O A "includes" relationship OA "extends" relationship O A "depends on" relationship O All the above

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Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.