11. An attribute that names or identifies entity instances is a(n):

A. entity.
B. attribute.
C. identifier.
D. relationship.

12. Properties that describe the characteristics of entities are called:

A. entities.
B. attributes.
C. identifiers.
D. relationships.

13. In which of the following can many entity instances of one type be related to many entity instances of another type?

A. One-to-One Relationship
B. One-to-Many Relationship
C. Many-to-Many Relationship
D. Composite Relationship

14. Entities of a given type are grouped into a(n):

A. database.
B. entity class.
C. attribute.
D. ERD.

15. Which of the following is NOT a basic element of all versions of the E-R model?

A. Entities
B. Attributes
C. Relationships
D. Primary keys