Apsychologist at harvard university wants to conduct an experiment using rats and mazes. the experiment doesn't involve humans. must the researcher have the irb give approval to conduct the experiment? 1.  no, as long as the experimenter follows the apa guidelines, the testing will be okay. 2.yes, the irb must approve any experiment regardless of whether it's animal or human testing. 3.no, as long as the funding to do the experiment came from a private source.4. yes, the irb must approve experiments only if animals are tested to prevent cruel treatment.