A consultant wanted to know whether immediate feedback or delayed feedback would be more effective in increasing a teacher's use of praise. She conducts the study at two elementary schools. In School A all teachers have immediate feedback. In School B all teachers have feedback that is delayed by one week. What research design methodology should be used?

Group of answer choices

Single case research design would be appropriate.

Group research design would be appropriate.

Either group research design or single case research design could be appropriate.

None of these are appropriate.