After creating a Video campaign,a fitness studio wants to measure their consideration campaign using a Brand Lift study.When should they setup the study to create the best control and exposed groups?

The fitness studio should setup the Brand Lift study**before the campaign serves any impressions**. By setting up a Brand Lift study before the campaign starts serving impressions,it ensures a clean division between the control group(those who haven'tseenthead)and the exposed group(those who have seen the ad).This allows for a more accurate measurement of how the video ad affected brand perception and behavior,ensuring that any changes in perception or behavior can be attributed to the ad campaign itself and not external factors.