Final answer:
The nominal group technique is not considered an essential component of an overall compliance plan by the OIG. Longitudinal research, benchmarking, and regular reporting are recognized as key elements of such plans.
Step-by-step explanation:
All of the following are elements supported by the Office of Inspector General (OIG) as essential components of an overall compliance plan except: c. nominal group technique. The other options listed, such as longitudinal studies, benchmarking, and regular reporting, are indeed recognized as part of a robust compliance strategy. Longitudinal research is a methodology that involves following a group of research participants for an extended period of time. This is different from the nominal group technique, which is a consensus development process often used in group decision-making rather than in compliance monitoring or research. The term "nominal group technique" is not commonly associated with the essential components of a compliance plan. Therefore, the answer is likely: c. Nominal group technique It's essential to note that you may want to check the most recent guidelines from the OIG or other authoritative sources for the latest recommendations on compliance program elements.