Question: import tkinter def main ( ) : main _ window = tkinter.Tk ( ) tkinter.mainloop ( ) if _ _ name _ _ = '

import tkinter
def main():
main_window= tkinter.Tk()
tkinter.mainloop()
if__name__='__main__':
main()
what does the code in line 4 do?
it gets a reference to the operating syatem's main window.
it creates the GUI root widget
it creates an instance of the MainWindow class

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