Where is the advance bar typically located in a theatre setup?

The advance bar is typically located downstage of the proscenium arch because it serves as a critical part of a theatre's communication and operational setup during a performance. Positioned in this area allows for optimal visibility for the performers and the production team, enabling them to closely monitor the action on stage while providing clear cues and signals. This placement ensures that the people operating the lights, sound, and other technical elements can effectively coordinate with the actors and the overall production without any obstructions.

This choice emphasizes the importance of strategic placement to facilitate smooth and efficient communication during performances, aligning with standard theatre practices. The other options do not provide this level of visibility and accessibility, which is vital for effective operation during live theatre.