____________ refers to the attribute that can uniquely identify tuples within the relation.
(A) Foreign key
(B) Consolidate key
(C) Alternate Key
(D) Primary key
Checking the options
(A) Foreign key - It is used to represent the relationship between two tables/relations.
(B) Consolidate key - It is not a valid key in the relational database.
(C) Alternate Key - It is a candidate key which has not been selected to be the primary key.
(D) Primary key - It is used to uniquely identify the tuples in a relation.
From the above explanation, we understand that the primary key is the attribute which can uniquely identify tuples within a relation.
So, the correct answer is (D)
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