Representational scenery can be applied only to plays written since the beginning of realism

A work's libretto is:

a. the producer's secretary, in charge of hiring and firing b. the text for a sung stage production c. the staging directions all actors must follow d. the lower notes of a musical score

What is the term for the phase of production in which scenes are shot?

a. vertical integration b. assembly line c. editing d. principal photog