Which of the Following Is a Major Responsibility of the Stage

Which of the following is a major responsibility of the stage manager?

A) alters the text and dialogue to make certain that the script serves his or her professional vision
B) identify ways in which previous directors have approached the same script or how they have approached production solutions
C) maintain the lighting/sound/scene designer's and director's vision of rhythm and pace through the proper and consistent calling of all cues during the run
D) All of these answers are correct.