IDNLearn.com: Your one-stop platform for getting reliable answers to any question. Join our Q&A platform to access reliable and detailed answers from experts in various fields.

Which of the following research activities with children qualifies for exemption?
- A researcher observing children on a playground to identify bullying behaviors.
- A researcher using small focus groups to talk to adolescents about the impact of stereotypes.
- A researcher using a socio-metric measure in the classroom to assess conflict resolution.
- A researcher interviewing fifth graders whose parents recently divorced.