Match the attribution model with its correct description.

Attribution models are the rules that determine how conversion credit is assigned to different ads a user interacted with before making a purchase. Single-Touch Models: First click and Last click are single-touch models. They are simple but often "biased." First-click overvalues awareness, while last-click overvalues the final "nudge," ignoring the earlier inspiration that Pinterest is famous for. Multi-Touch Models: Linear and Position-based provide a more holistic view. Since Pinterest users are often "planners" who gather ideas over weeks, these models help advertisers see how their top-of-funnel content contributed to a sale that might have been finalized via a search or a direct visit later. Strategy: For Pinterest specifically, moving away from "Last click" is often recommended. Because Pinterest is a discovery engine, a last-click model might only capture a tiny fraction (sometimes estimated at less than 2%) of the platform's actual influence on the total path to purchase.