Answer:
Informed consent
Step-by-step explanation:
Participants sign a document affirming that they have been told the basic outllines of the study and are aware of what their participation will involve this is known as informed consent.
Informed consent is an ethical principle in research which involves the researcher telling the research subjects or participants the aim of the experiment, its outline, the risk involved and that there participation is totally voluntary and they can decide to withdraw from the study at anytime. It is a voluntary agreement that is signed by the participants of the study.