Question: Which of the following is NOT a valid normalization form?

Options:

1. First Normal Form (1NF)
2. Second Normal Form (2NF)
3. Third Normal Form (3NF)
4. Fourth Normal Form (4NF)

Correct Answer: Fourth Normal Form (4NF)

Solution:

All listed forms are valid normalization forms; however, 4NF is less commonly discussed than the first three.