Supertypes and Subtypes

An entity type that has a parent-child relationship with one or more subtypes (correct)

A generic entity that has a relationship with one or more subtypes

A subgrouping of entities within a supertype entity

An entity type that has unique attributes different from its subtypes

Subtypes have primary keys that are always identical to the supertype

Subtypes have unique attributes that are usually the same as the supertype

Subtypes are generic entities that have relationships with one or more supertypes

Subtypes are subgroupings of entities within a supertype entity (correct)

The primary keys of supertypes and subtypes are never the same

The primary keys of supertypes and subtypes are always identical (correct)

The primary keys of subtypes are usually different from the supertype

The primary keys of subtypes are always identical to the supertype