A) Do not enter a value in the foreign key field of a child table if that value does not exist in the primary key of the parent table
B) Do not enter a value in the primary key field of child table if that value does not exist in the primary key of the parent table
C) Do not enter a value in the foreign key field of a parent table if that value does not exist in the primary key of the child table
D) All of the above
Correct Answer: A
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