Question: In the extended entity - relationship model ( EERM ) , which of the following statements best describes the completeness constraint? a . The completeness

In the extended entity-relationship model (EERM), which of the following statements best describes the completeness constraint?
a. The completeness constraint specifies whether each entity subtype occurrence must also be a member of at least one supertype.
b. Partial completeness constraint means that every supertype occurrence is a member of a subtype.
c. The completeness constraint specifies whether each entity supertype occurrence must also be a member of at least one subtype.
d. Total completeness constraint means that every subtype occurrence must be a member of at least one supertype.
In the extended entity-relationship model (EERM), which of the following statements

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