In RDBMS, different classes of relations are created using __________ technique to prevent modification anomalies.

A functional dependency is a constraint that describes the relationship between attributes in a relation. Data integrity refers to the accuracy and consistency of data stored in a database, data warehouse, data mart or another construct. Referential integrity is a relational database concept, which states that table relationships must always be consistent. Normalization is a process of organizing the data in the database to avoid data redundancy, insertion anomaly, update anomaly & deletion anomaly. 1NF, 2NF, 3NF and BCNF are types of normal forms. So, option (D) is correct.