Comment on the ethics of the following situations:
a. A researcher plans to use invisible ink to code questionnaires to identify respondents in a mail survey designed to get honest opinions from people who have filed to run for political office. The code will allow their identities to be known by the researcher. end of the questionnaire, it includes a request for a donation.
b. A political action committee conducts a survey about its particular cause. At the
c. A telephone interviewer calls at 1 P.M. on Sunday and asks the person who answers the phone to take part in an interview.