Which method is used to protect the structure and windows of a workbook?

The method used to protect the structure and windows of a workbook is by selecting the option to "Protect Workbook." This action prevents unauthorized changes to the layout of the workbook, such as modifying, deleting, or adding sheets. When you protect the workbook structure, it ensures that users cannot inadvertently alter how the workbook is organized, which is crucial for maintaining the integrity of the document.

Protecting the workbook allows users to safeguard the overall components and organization of their files, important in collaborative environments where multiple users may access the document. It is essential to note that protecting a workbook differs from protecting an individual sheet, which focuses on the information and formatting within a specific worksheet rather than the structure of the workbook as a whole. Options related to saving or marking a document as final do not provide any protective measures for the structure or windows of a workbook.