Quit/close terms do not match

There's some inconsistency in the way that there is a "Close" button that does the same thing as the "Quit" menu item, but they are labelled differently. There are two ways to solve this, I think:

A) Rename "Quit" to "Close" for consistency
B) Consider the close button in the main gui as "rendundant" and get rid of it:
- it duplicates the functionality of the window manager's close button
- it appears in almost the same "toolbar region" as contextual firewall rule actions such as Add and Remove
- however, I noticed that other gnome "preferences" dialogs systematically have a Close button there. As such, it may be an argument towards solution A.

Unless you're telling me that in this case, Quit and Close really are different?