In Milgram's Original Experiment

In Milgram's original experiment:

A) the "learner" was given actual electric shocks, some of them very severe, by the "teacher' during the course of the experiment.
B) the "teacher" was allowed to decide which level of shock, if any, to administer to the "learner."
C) the subject assigned to the "teacher" role was given a sample electric shock at the 45-volt level.
D) the "learner" was allowed to leave once the level of shock administered by the "teacher" became too painful.