Dr. Lopez: As anthropologists, we are committed to learning about cultures without intervening in the lives of the people in those cultures. For this reason, we should observe people passively by means of on-site video and sound recordings, rather than conducting interviews with those people. Dr. Tseung: Whereas your aim is admirable, your method is completely misguided. After all, the mere presence of video cameras and recording devices invariably constitutes an intervention into the lives of the people being filmed or recorded. Which one of the following is a point at issue between Dr. Lopez and Dr. Tseung? ['whether it is less troublesome for anthropologists to conduct interviews than it is for them to make on-site video and sound recordings', 'whether interviews conducted by anthropologists with people from a particular culture are an effective means of learning about that culture', 'whether it is possible to observe people passively by means of on-site video and sound recordings without intervening in the lives of those people', 'whether video and sound recording devices would be more intrusive in cultures in which those devices are relatively uncommon than they are in cultures in which they are relatively common']