Lilia wants to save a workbook as a read-only file.She should encrypt the workbook with a password.

To save a workbook as read-only, Lilia should use the "Save As" option and then choose "General Options" to set the workbook as read-only, rather than encrypting it with a password. Encrypting with a password would require users to enter the password to open the workbook, not just to save changes to it.