An experiment that takes place in a lab is designed to determine if the number of people watching makes one more patient with being asked annoying questions. The experiment uses some deception. Which...

An experiment that takes place in a lab is designed to determine if the number of people watching makes one more patient with being asked annoying questions. The experiment uses some deception. Which of the following is/are true?

a. The experimenter must obtain informed consent of each participant before the experiment and must debrief them afterwards.

 b. Because the experiment involves some deception, no consent is necessary, only debriefing.

c. During debriefing, the experimenter is not obliged to tell the participants about the real nature of the study lest they should tell participants in the waiting room on their way out.

 d. During debriefing, the experimenter must tell the participants about the real nature of the study