The correct answer is: A. properties window.
The properties window shows the various characteristics of selected objects or controls. It is a dockable window that can be displayed by clicking the Properties button on the toolbar or by selecting View > Properties Window from the menu.
The properties window is divided into two sections: the categories pane and the properties pane. The categories pane lists the different categories of properties, and the properties pane displays the values for the selected category.
The properties window can be used to change the properties of an object or control. To do this, select the object or control in the designer, and then change the values in the properties pane.
The properties window is a powerful tool that can be used to customize the appearance and behavior of objects and controls.
The other options are incorrect because:
- The project explorer is a window that shows the files in a project.
- The menu bar is a bar at the top of the window that contains menus.
- The toolbox is a window that contains controls that can be added to a form.