Brenda 启动了一项推广活动，提供附带销售线索表格的白皮书下载。她打算通过展示转化率来证明其营销效果。她使用的是哪种归因模型？

Brenda is using a Last-Touch Attribution model. This model attributes 100% of the conversion credit to the very last interaction a customer had before converting. In this scenario, the white paper download via a lead form is the final touchpoint before Brenda measures the conversion. Multi-touch attribution models distribute credit across multiple touchpoints in the customer journey, which isn't what Brenda is doing if she's solely looking at the conversion rate from the white paper download. First-touch attribution would give all credit to the initial interaction, which isn't being measured here as the primary conversion point. Layered attribution is not a standard, widely recognized attribution model.