16. An entity class is a collection of entities and is described by the structure of the entities in that class.

A. True
B. False

17. Relationship classes are associations between entity classes.

A. True
B. False

18. An identifier typically uses more than one attribute.

A. True
B. False

19. An identifier determines the type of relationship that an entity has.

A. True
B. False

20. A recursive relationship is a relationship between an archetype and an instance of that archetype.

A. True
B. False