Since you aren't sure that all recipients have access to Microsoft Word, you should save the file by using the "Save as" command.
Microsoft Word can be defined as a word-processing software program that is designed and developed by Microsoft Inc., so as to avail its end users an ability to type, format, adjust and save text-based documents or files.
A file can be defined as a computer resource or type of document that avails an end user the ability to save or record data as a single unit on a computer storage device.
In this scenario, we can infer and logically deduce that you should save the file by using the "Save as" command because you aren't sure that all recipients have access to Microsoft Word.
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