Explanation: Book1 is an example of how option (4) Name box is used to number and name workbooks during each work session. In Excel, the Name box is located next to the formula bar and displays the cell reference of the active cell. It also allows you to assign or change a name for a selected range of cells or a workbook. By default, when you open a new workbook in Excel, it is typically named as "Book1" or a similar default name. However, you can change the name of the workbook by using the Name box or other options available in Excel.