Which advantage of Desktop Publishing is related to cost-saving?

The advantage related to cost-saving in Desktop Publishing is that it allows individuals to work from home, thereby saving on travel costs. By eliminating the need to commute, users can significantly reduce expenses associated with transportation, such as fuel or public transport fares. This flexibility can also lead to savings in time and increased productivity since less time is spent traveling.

In the context of the other options, while faster prototypes may streamline the design process, this does not directly pertain to reduced costs. Similarly, requiring less technical knowledge can make the tools more accessible but doesn't itself translate into cost savings. Guaranteed better print quality can enhance the final product but does not address the initial costs associated with publication and delivery. Hence, the ability to work from home stands out as the most direct cost-saving advantage in desktop publishing.