Final answer:
The best print method for distributing a FrameMaker document to customers using different operating systems is exporting the document to PDF format, as it is universally accessible and retains original formatting.
Step-by-step explanation:
If you have created a large course in FrameMaker and need to distribute it to customers who use different operating systems (Windows, Linux, and Mac), the best method for making your document universally accessible would be b) Exporting the document to PDF format. PDF, which stands for Portable Document Format, is widely used and can be opened on virtually any platform without the need to have FrameMaker installed. It also retains the formatting and layout of the original document.
While printing to a PostScript printer could also be an option, it would not be as straightforward for your customers, as they would need to have the appropriate printers or software to read PostScript files. Printing using the XPS printer driver is limited to Windows environments and therefore not suitable for Linux and Mac users. Directly printing from FrameMaker is not a viable option since clients do not have FrameMaker.