À quelle image correspond le code ci-dessous:

VBox root = new VBox();
Scene scene = new Scene(root,200,200);
Button B1 = new Button("Bouton 1");
Button B2 = new Button("Bouton 2");
Button B3 = new Button("Bouton 3");
Button B4 = new Button("Bouton 4");
HBox boite = new HBox();
boite.getChildren().addAll(B2, B3);
root.getChildren().addAll(B1, boite, B4);