Question: is the result of adding more semantic constructs, such as entity supertypes, entity subtypes, and entity clustering to the original entity - relationship model. a

is the result of adding more semantic constructs, such as entity supertypes, entity subtypes, and entity clustering to the original entity-relationship model.
a.
Specialization Hierarchy
b.
Extended Entity Relationship Diagram
c.
Extended Entity Relationship Model
d.
Relationship Model

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