Matches between __________ and __________ are important because they represent references from one relation to another.

A.
Foreign key and primary key

B.
Foreign key and candidate key

C.
Candidate key and primary key

D.
Primary key and secondary key

Explanation:
Foreign key to primary key matches are important because they represent references from one relation to another and establish the connections among these relations. If an attribute in one table has a value matching the primary key inanother table and there is a relationship set up between the two of them, this attribute is considered a foreign key.