According to Hao, what happened in a recent study in which software engineers were asked to read a code of ethics before resuming their work on AI projects? Question 19 options: A) They showed significantly better ethics in their work with respect to human rights B) They merged facial recognition software with a criminal gang database for the utilitarian goal of increasing public safety for more people C) They were better able to solve the "trolley problem" D) They did not change their workplace behavior