Let's understand the functions of the given commands in MS-Word.
(B) Save: The 'Save' command updates the existing file with the latest changes. If the file is new, it will open the 'Save As' dialog box. On an existing file, it overwrites the original.
(C) Save As: The 'Save As' command is used to save a copy of the current document. It opens a dialog box that allows you to specify a new file name, file type, or location for the new copy. The original file remains untouched in its original location.
(A) Print preview shows how the document will look when printed.
(D) Edit refers to the general process of making changes to the document.
The feature that allows preserving the original file while creating a new copy with a different name or location is 'Save As'.