Answer: REPLICATION
Explanation:An A-B design is a single case or a single subject design that deals with the study and analysis of both applied Behavior and Behaviors which concerns Human and non Human subjects. This type of design does not involve repetition of treatments which means it is a one case scenario, A-B design is a two phase design made up of a baseline known as ("A" phase) without change and a ("B" phase) known as a treatment phase. If during the experiment their is a change,it means the it means the treatment has an effect.