The correct answer is option 'A': Referential.

Referential integrity is a concept in database management systems that ensures the consistency and integrity of data between related tables. It is enforced through referential integrity constraints, which define rules for maintaining the relationships between tables.

In the given question, the statement is referring to the concept of referential integrity. Let's break it down and understand it in detail:

1. Referencing Relation:
- In a database, there are multiple tables that are related to each other through foreign keys. The table containing the foreign key is called the referencing relation.

2. Referenced Relation:
- The table to which the foreign key refers is called the referenced relation.

3. Attributes:
- Attributes are the columns of a table that store specific types of data.

4. Integrity Constraint:
- Integrity constraints are rules that define the valid values and relationships between attributes in a database.

Now, according to the given statement, the values in the attributes of any tuple (row) in the referencing relation must also appear in the specified attributes of at least one tuple in the referenced relation. This means that the foreign key values in the referencing relation must match the primary key values in the referenced relation.

For example, let's consider two tables: "Employees" and "Departments". The "Employees" table has a foreign key attribute called "department_id" that references the primary key attribute "department_id" in the "Departments" table.

To enforce referential integrity, the values in the "department_id" column of the "Employees" table must exist in the "department_id" column of the "Departments" table. In other words, every "department_id" value in the "Employees" table must correspond to a valid "department_id" value in the "Departments" table.

By enforcing this referential integrity constraint, we ensure that the data remains consistent and accurate. It prevents orphaned records (records with invalid foreign key references) and maintains the integrity of the relationships between tables.

Therefore, the correct integrity constraint that ensures the matching of values between the referencing and referenced relations is the "Referential integrity constraint" (option 'A').

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