Customer loyalty appA retailer introduces a loyalty app that offers digital coupons. After one year, repeat purchase frequency increases, and marketing claims:“The app is the main driver of improved customer loyalty.”Which of the following, if true, most strengthens this claim?

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Customer loyalty app<br>A retailer introduces a loyalty app that offers digital coupons. After one year, repeat purchase frequency increases, and marketing claims:<br>“The app is the main driver of improved customer loyalty.”<br>Which of the following, if true, most strengthens this claim?