Question: A specialization hierarchy reflects the _ _ _ _ _ . a . grouping of common characteristics and relationships of subtypes b . 1 :

A specialization hierarchy reflects the _____.
a. grouping of common characteristics and relationships of subtypes
b.1:1 relationship between an entity supertype and its subtypes
c. bottom-up process of identifying a higher-level entity supertype from lower-level subtype
d. virtual entities used to represent multiple entities and relationships

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