A researcher wanted to systematically investigate the effectiveness of restraint on reducing challenging behaviors in a student with intellectual disabilities. She used a standardized scale to quantify challenging behaviors at three time points she recorded number of challenging behaviors before beginning a restraint protocol, used the restraint protocol and measured the behaviors a second time, then stopped using the restraint protocol and measured challenging behaviors one last time. Which type of design best describes this scenario?

Group of answer choices

ABA Reversal Design

ABAB Reversal Design

Multiple-Baselines design across subjects

Multiple-Baselines design across behaviors