Final answer:
In cases of active deception in consumer studies, ethical practice necessitates a full debriefing, which includes informing participants they've been misled, explaining why the deception was needed, and outlining the overall purpose of the research.
Step-by-step explanation:
When deception has been used in a study involving active deception of consumers, it is ethically required to provide a full debriefing to participants after the conclusion of the study. This debriefing must include a full, honest explanation about the purpose of the experiment, thoroughly explaining how the collected data will be used, the reasons why deception was necessary, and supplying information on how to obtain additional details regarding the study. Therefore, the correct answer to when disguise has involved an active deception of consumers is d. All of these are correct, as each component is a critical part of ethical research practices.