An advertiser is launching its first campaign on Pinterest to advertise a promotion valid only to people who have previously made a purchase from its brand. Which targeting tactic allows the advertiser to reach this audience?

The correct answer is Customer list. This targeting tactic allows advertisers to upload a list of existing customers (e.g., email addresses) directly to Pinterest. Pinterest then matches these customers to their user profiles, enabling the advertiser to specifically target this group with ads. This is ideal for promotions exclusively for previous purchasers. Demographic targeting would be too broad, as it focuses on age, gender, and location, not purchase history. Engagement targeting reaches users who have interacted with the advertiser's content on Pinterest, not necessarily past purchasers. Actalike (lookalike) targeting finds new users who share characteristics with an existing audience, which is not suitable for reaching existing customers.