What is the default file name when you create a new workbook in Microsoft Excel?

This question tests knowledge of default naming conventions in Microsoft Excel.

• Correct Option D: "Book1" is the standard default file name for a new, unsaved workbook in Microsoft Excel. When you open Excel or create a new workbook without specifying a name, it is automatically assigned "Book1", then "Book2", "Book3", and so on for subsequent new workbooks in the same session.
• Option A: "NewBook1" is not the default naming convention used by Excel.
• Option B: "Excel1" is also not the default name.
• Option C: "Sheet1" is the default name for the first worksheet within a new workbook, not the workbook file itself. A workbook contains one or more sheets.