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