Tuples can be uniquely identified by an attribute or set of attributes known as a ___ key.Question 10Answera.Primaryb.Candidatec.Foreignd.Composite

To identify which term correctly fills in the blank for the statement regarding tuples, we need to consider the definitions of the options provided.

1. Primary Key: This is a specific attribute or set of attributes that uniquely identifies each tuple in a relation. It cannot contain null values and must be unique.

2. Candidate Key: This refers to an attribute or set of attributes that could potentially serve as a primary key. A relation may have multiple candidate keys, but only one can be chosen as the primary key.

3. Foreign Key: This is an attribute or set of attributes that creates a link between two tables. It refers to the primary key of another table and does not uniquely identify tuples within its own table.

4. Composite Key: This is a key that consists of two or more attributes that together uniquely identify a tuple in a relation.

Final Answer

The correct answer is a. Primary.