One of these is not part of ER diagramsQuestion 1Select one:a.Entityb.Relationshipc.Attributed.Primary Key

Break Down the Problem

1. Identify the elements that are part of ER (Entity-Relationship) diagrams.
2. Determine which option does not belong in the context of ER diagrams.

Relevant Concepts

1. Entity: Represents a real-world object or concept.
2. Relationship: Depicts the connection between entities.
3. Attribute: A property or characteristic of an entity.
4. Primary Key: A unique identifier for an entity in a database.

Analysis and Detail

1. Entities are essential components of ER diagrams.
2. Relationships illustrate how entities interact.
3. Attributes provide details about entities.
4. Primary Key is crucial for identifying unique records but is not typically represented as an overarching part of the ER diagram structure like entities, relationships, and attributes are.

Verify and Summarize

• Upon assessing the components, "Primary Key" is an important aspect of relational databases but is not a fundamental part of ER diagrams itself.

Final Answer

d. Primary Key