Northern Trail Outfitters (NTO) is creating a birthday journey and one of the requirements is to divert anyone who has redeemed the promotional code before reminder emails are sent on the 15th and 20th of each month. Their transactional information, which includes redeemed promo codes, is housed in a separate data extension than the one used for journey injection. NTO needs to use an attribute to attribute comparison on the customer number field in the journey source and transaction data extensions. Which activity would they use to accomplish this?