Lisa’s campaigns have been getting positive results for the last 6 months. How can Sal use the data they’ve collected over that time to engage contacts who have already purchased?

The correct answer focuses on leveraging past purchase data to re-engage existing customers, specifically those with a high Customer Lifetime Value (CLV). Rewarding loyal, high-value customers is a proven strategy for retention and repeat business. The other options are less direct or effective for this specific goal. Using the subject line helper aims to increase open rates generally, not specifically to engage past purchasers. Creating a segment for recently added contacts doesn't target past purchasers and might include those who haven't bought anything yet. Assigning star ratings is a classification method, not an engagement strategy in itself, and doesn't directly use purchase data to craft a campaign.