In order to follow the ethical principles for research as established by the APA, psychologists should

a. recruit participants for experiments by placing ads in college newspapers.

b. publish the full results, including participant information, of their research online.

c. keep their operational definitions secret so that they cannot be copied by other researchers.

d. debrief the participants after the conclusion of the research.

e. allow minors to choose to be participants if they wish to.