Final answer:
To preserve the original version of a workbook and edit a copy, use the a) 'Save As' function to create a new file with the changes, keeping the original file intact.
Step-by-step explanation:
To preserve the original version of a workbook so you can make changes to a copy of it, you would Save As. The Save As function allows you to create a new file with a different name or location while keeping the original file unchanged. This is important when you want to make edits or modifications to a document without altering the original version. For example, if you have a financial report for 2020 and want to create a similar report for 2021, you can use Save As to create a new workbook for 2021 while keeping the 2020 report intact. Options such as Save would overwrite the existing document, Export is typically used for changing file formats or sharing, and Print is intended for creating a hard copy of the document.