e the correct answerWhich forms are based on the concept of functional dependency:Options1NF3NF2NF4NF

The forms that are based on the concept of functional dependency are:

1. 1NF (First Normal Form): This form ensures that each attribute in a relation contains only atomic values and there are no repeating groups or arrays of values.

2. 2NF (Second Normal Form): This form builds upon 1NF and ensures that all non-key attributes are fully dependent on the entire primary key. In other words, there should be no partial dependencies.

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

4. 4NF (Fourth Normal Form): This form deals with multi-valued dependencies and ensures that there are no non-trivial multi-valued dependencies between attributes.

So, the correct answer is options 1NF, 2NF, 3NF, and 4NF.