Choose the correct answerWhich forms are based on the concept of functional dependency:Options3NF2NF1NF4NF

To choose the correct answer, we need to understand the concept of functional dependency and how it relates to the different normal forms.

1. 1NF (First Normal Form): This form deals with the elimination of duplicate data and ensures that each attribute in a relation contains only atomic values. It does not directly consider functional dependencies.

2. 2NF (Second Normal Form): This form builds upon 1NF and introduces the concept of functional dependencies. It ensures that all non-key attributes are fully functionally dependent on the entire primary key. In other words, it eliminates partial dependencies.

3. 3NF (Third Normal Form): This form further refines the concept of functional dependencies. It ensures that all non-key attributes are dependent only on the primary key and not on any other non-key attributes. It eliminates transitive dependencies.

4. 4NF (Fourth Normal Form): This form deals with multi-valued dependencies, which are a special type of functional dependency. It ensures that there are no non-trivial multi-valued dependencies in a relation.

Based on the above explanations, the correct answer is: 2NF and 3NF. These two normal forms are based on the concept of functional dependency.