In Terms of Goffman's Theory, What Purpose Does the Public

In terms of Goffman's theory, what purpose does the public bathroom serve?

A) it is a place where we can go to urinate and defecate and without it, society would falter.
B) the bathroom provides a back stage region to perform behavior that often cannot be done in the front stage.
C) public bathrooms are the oasis in the desert for people who need a to talk about others.
D) society demands that the public bathroom offer a save haven where we can perform any act without having to hide it from others.