Final answer:
Martha can use the Print Preview feature to see how a report will look when printed, allowing her to spot and fix any layout or formatting issues before actually printing the document.
Step-by-step explanation:
To show exactly how one of the reports designed for Martha will look when printed, Martha can use the Print Preview feature. This feature displays a virtual representation of how the document will appear on paper. It is a useful tool to avoid printing errors and to save on paper and ink as it allows users to see exactly how their document will look once it is printed, without actually printing it. This way, if there are any issues with the layout or formatting, they can be identified and corrected before the actual printout. Neither Print Layout, Print Test, nor Print Design are standard features specifically designed for previewing a document before printing.