Which of the following revelations from a different research studies came to be known as the Hawthorne effect? a. Group members subjecting those workers who violate the group norms to sanctions. b. Productivity increasing regardless of the level of illumination in the workplace. c. Workers concealing the true potential efficiency of a work system to protect their interests. d. Workers productivity being affected more by the attention received from researchers than by the work setting. e. Employees in a ""no-talking"" workplace developing ways of talking to one another out the sides of their mouths.