Given the two following relations, what attribute of PROJECT could have a foreign key constraint referring to the DEPARTMENT table? DEPARTMENT Dname Research Administration Headquarters PROJECT Pname ProductX ProductY ProductZ Pnumber Plocation 1 Bellaire 2 Sugarland 3 Houston Computerization 10 20 Reorganization Newbenefits 30 O Plocation O Pnumber O Dnum Dnumber OPname 5.M 1 Stafford Houston Stafford Dnum 5 5 5 4 1 4 Mgr_ssn 333445555 987654321 888665555 Mgr_start_date 1988-05-22 1995-01-01 1981-06-19

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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.