In specialization hierarchies with multiple levels of supertype and subtypes, a lower-level subtype can inherit only a few of the attributes and relationships from its upper-level supertypes. a. true. b. false.

False

Explanation:

Specialization is the top-down process of identifying lower-level, more specific entity subtypes from a higher-level entity supertype.

An entity supertype is a generic entity type that is related to one or more entity subtypes.

Entity supertypes and subtypes are organized in a specialization hierarchy.

Entity subtypes do inherit many of the relationships in which the supertype entity participates.

An entity supertype can have disjoint or overlapping entity subtypes.