Question: Under what circumstances are composite primary keys appropriate? a . as identifiers of composite entities, where each primary key combination is allowed only once in

Under what circumstances are composite primary keys appropriate?
a. as identifiers of composite entities, where each primary key combination is allowed only once in the M:N relationship
b. as identifiers of weak entities, where the weak entity has a strong identifying relationship with the parent entity
c. All of these choices are correct.
d. None of these choices are correct.

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