Final answer:
The new term added by the final rule for determining which studies require posting of the IRB-approved consent form used to enroll subjects is a. research.
Step-by-step explanation:
The new term added by the final rule that should be used for determining which studies require posting of the IRB-approved consent form used to enroll subjects is Research. The IRB (Institutional Review Board) is responsible for reviewing research proposals and ensuring that human subjects are protected. Informed consent is one of the key protections mandated by law, and it requires researchers to clearly explain the risks of participation to the subjects and obtain their written consent.