Which one of the following pairs is correctly matched in the context of database design?
- Result of taking a subset of a higher-level entity set to form a lower-level entity set is Specialization
- Result of taking the union of two or more disjoint(lower-level) entity sets to produce a higher-level entity set is Generalization
- An abstraction in which relationship sets (along with their associated entity sets) are treated as higher-level entity sets, and can participate in relationships.Aggregation
- Express the number of entities to which another entity can be associated via a relationship set Mapping cardinalities
So, option (D) is correct.
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