Unity Scene open on build?

Which scene opens in a unity android .aab file when you build it? The scene you had open while building or scene number 1 of build settings?

I really need to know, because I let the wrong scene opened while building thanks!

There is one rule of opening unity built scene. Open a Build Settings, Click on check box for scenes to build you want, and See the index in red box.

0 is always first open scene. (you can determine a sequence of scenes using drag and drop)