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The correct choice is Progressive because it refers to Unity's lightmapping technique that allows for the baking of lightmaps and Light Probes with incremental updates. This is particularly useful during the development process, as it enables developers to see changes in lighting immediately without the need to perform a full bake each time adjustments are made. The Progressive Lightmapper calculates lighting information in a way that updates progressively, meaning that as the baking process continues, artists can iteratively assess the changes and make refinements, leading to a more efficient workflow.

In this context, Static Lighting refers to using a static approach to lighting which does not provide the iterative updating feature that Progressive does. Real-time Lighting involves dynamically calculated lighting that changes during gameplay rather than being pre-calculated, which means it does not offer baked solutions. Baked Shadow pertains to shadows that are pre-computed for static objects and do not involve the overall lightmap calculation and progressive updates associated with the Progressive Lightmapper. This makes Progressive the most suitable option for developers requiring baked solutions within an iterative workflow.