21: please help vey urgent!!!

21. When a one-to-many relationship in E-R model is mapped into relational data model, the one-to-many relationship is generally represented as

a. a primary key.
b. a foreign key.
c. a primary key in one table and a foreign key in another table or the same table
of the primary key.
d. a table with a pair of foreign keys, each of which is associated to a primary key
in its parent table.


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