Which of the following structure represent the entity sets?Select one:a.Double Rectangleb.Diamondc.Rectangled.Ellipses

Break Down the Problem

1. Identify what is meant by "entity sets" in the context of data modeling, especially within Entity-Relationship (ER) diagrams.
2. Evaluate the options given to determine which structure appropriately represents entity sets.

Relevant Concepts

1. In an ER diagram:
   • Entities are represented by specific shapes, which help identify their role within a database schema.
   • Entity sets consist of a collection of similar entities.

Analysis and Detail

1. Double Rectangle: Typically represents weak entities or more specific types of entities, not standard entity sets.
2. Diamond: Represents relationships between entities, not the entities themselves.
3. Rectangle: This is the standard shape used to represent entity sets.
4. Ellipses: Generally represent attributes of entities, not the entity sets.

Verify and Summarize

• The rectangle is the standard representation of entity sets in ER diagrams, while diamonds denote relationships and ellipses are used for attributes.

Final Answer

The structure that represents entity sets is c. Rectangle.