If Iris' business goal is to drive traffic to the product detail page, which advertising metrics will help them measure performance?

The correct answer is "Detail page views." Detail page views are the most relevant metric for measuring performance when the business goal is to drive traffic to the product detail page. This metric tracks the number of times users visit the product page after engaging with an ad, directly indicating how well the campaign is achieving the objective of increasing traffic. While impressions show how often an ad is displayed and click-through rate (CTR) measures how many people clicked the ad, detail page views specifically reflect the success of those clicks in bringing users to the product detail page, making it the most accurate indicator for this business goal.