Concept:Normalisation organises a relational database using normal forms such as 1NF, 2NF, and 3NF to reduce redundancy.Explanation:The normal forms covered in relational database design are First Normal Form (1NF), Second Normal Form (2NF), and Third Normal Form (3NF).These are all genuine normal forms.Fourth Normal Form (4NF) is not one of the normal forms considered in the WAEC syllabus.Therefore, 4NF is the option that is not a normal form.Answer:A. 4NF