Which of the following is a violation of the APA Ethical Code for Human Research? Students are told that their scores on a timed math test will determine their final course grade. When the study is completed, the researcher discloses that the study was investigating the effects of anxiety and that the test results would not actually determine their math grade. When the experiment is over, the researcher tells the participant "thank you and goodbye" without disclosing any information or answering any questions. Questionnaire data is collected from students after obtaining written informed consent forms from them. A psychologist answers participants' questions about the research before it begins