On an ER diagram, which shape is used to represent an entity?Select one:a.Circleb.Diamondc.Ovald.Rectangle

Step 1: Identify the Shape Representing an Entity

In an Entity-Relationship (ER) diagram, the shapes used for different components have specific meanings.

Step 2: Relevant Concepts

1. An entity represents a real-world object or concept, such as a person, place, or thing.
2. Different shapes in ER diagrams are used as follows:
   • Circle: Used for attributes
   • Diamond: Used for relationships
   • Oval: Not typically used in standard ER diagrams
   • Rectangle: Used for entities

Step 3: Analysis and Detail

ER diagrams help to visualize the data structure and relationships in database management. Entities are the primary focus since they represent the data being stored.

Step 4: Verify and Summarize

Based on the standard notation in ER diagrams, the rectangle is universally accepted as the shape that represents an entity.

Final Answer

The correct answer is d. Rectangle.