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

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

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