What is a geo-based experiment?

The correct option is Geo experiments use non-overlapping geographic regions that are randomly assigned to a control or treatment group. because this methodology ensures statistical purity by preventing "contamination" between the two groups. By isolating specific geographic areas—such as different cities or regions—into distinct control (no ad spend change) and treatment (increased or modified ad spend) zones, advertisers can accurately measure the incremental lift in offline sales or store visits directly attributable to their marketing efforts. This non-overlapping structure is vital for establishing a clear causal relationship between digital investment and physical store performance, as it ensures that the behavior observed in the treatment area is not being influenced by the same variables present in the control area.