Final answer:
Correct Option is B) .The shortcut key to update fields in a document is F9. This command refreshes elements such as page numbers and formulas in programs like Microsoft Word. The F9 keystroke does not pertain to command line operations.
Step-by-step explanation:
You can update fields in a document by pressing the shortcut key F9. This is particularly useful in Microsoft Word where fields can include things such as page numbers, table of contents, or formula calculations. When you press F9, the software re-calculates or updates the information in these fields to reflect any changes made to the document.
The command line can also be utilized for making specific changes within various software environments. For example, in a software application's command line, you might use the Command: del :.b to delete specific elements or Command: focus to change focus to a particular object or area within the application. However, updating fields with F9 is a different operation typically related to word processing software rather than the command line.