Final answer:
The Maplex extension for ArcGIS Desktop offers advanced label placement tools, ensuring more readable and professional-looking maps with features like label stacking and conflict resolution.
Step-by-step explanation:
The ArcGIS Desktop extension that can be used to create a map with advanced label placement options is Maplex. This extension provides sophisticated labeling tools that allow users to place labels using complex algorithms, which can lead to more readable and professional-looking maps. Maplex offers advanced features such as label stacking, label fitting, font reduction, and conflict resolution. These features help in placing labels in a way that avoids overlapping and ensures that they are placed relative to the features they describe in the most efficient and aesthetically pleasing manner.