Exam Certified Marketing Cloud Email Specialist topic 1 question 17 discussion

Northern Trail Outfitters has a list of Platinum members containing 50,000 subscribers and a Lifetime Member list containing 20,000 subscribers; 7,000 subscribers in the Lifetime Member list also exist in the Platinum Member list.
An email was deployed to the Platinum members, but the marketing team would now like to send the same email to the Lifetime Member list.
Which feature should be used when sending the second email to ensure that the 7,000 subscribers that exist on both lists don't receive the same email twice?