Afiya 正在为她的领英推广活动衡量品牌提升。当她设置品牌提升测试时会发生什么情况？请选择两个答案。

Brand Lift studies measure the impact of advertising on brand metrics. When setting up a Brand Lift test, LinkedIn divides the target audience into two groups: a control group (who do not see the ad) and a test group (who do see the ad). This allows for a comparison of brand perception between those exposed to the ad and those who weren't. A brand survey is then designed and shown to both groups 1 to 7 days after ad exposure. This timing ensures the survey captures the immediate impact of the ad. Showing the survey to both groups is crucial for isolating the ad's effect. The incorrect options either misrepresent the group division (three groups) or the survey distribution (only to the test group), which would invalidate the comparative analysis, or introduce a different metric (reach and frequency) not directly related to Brand Lift methodology.