If you wanted to determine whether an ad drove incremental result, you would choose the Geo-Based method.

• Product-based
• User-Based
• Store-Based
• Geo-Based

The correct answer is: Geo-Based

Explanation: To test an ad’s incrementality, Google uses experiments with designated treatment and control groups rather than backward-looking comparisons. The Geo-based experiments method helps gauge the impact of ads on critical business outcomes, like online purchases or in-store sales, effectively revealing the ad’s incremental value.