3) A relation is said to be in 3NF if it is in 2NF and no nonprime attribute of R is blank the primary key. A) an alternate for B) transitively dependent on C) Part of  D) partially functionally dependent on E) fully funcionally dependent on

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Q: Describe three circumstances in which a substitute key for a relation's primary key should be…

A: The question has been answered in step2

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A: Below I have provided the detailed query of the given question:

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A: The answer for the above question is given in the below step.

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A: INTRODUCTION:

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.