When you save a word processing document, a file is created. Depending on the specific word processing software you are using (such as Microsoft Word, Google Docs, etc.), the file may have various formats such as .doc, .docx, .odt, etc. The correct answer among the terms you provided is neither "system," "program," "access," nor "data," but rather "file" would be the appropriate term.
However, if you're referring to something else in a broader context related to the options given, please clarify!