Question: When looking into the extended entity - relationship model ( EERM ) , which of the following statements is not valid about entity supertypes and

When looking into the extended entity-relationship model (EERM), which of the following statements is not valid about entity supertypes and subtypes?
The entity subtype contains common characteristics:
Entity supertype and subtype are based on a hierarchical structure.
The entity supertype contains common characteristics with subtype.
An entity supertype is a generic entity type related to one or more entity subtypes.
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When looking into the extended entity-relationship model (EERM), which of the

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