Northern Trail Outfitters continually adds rows for subscribers to a data extension via API, populating...

Because the data extension is continually appended to via API over time — rather than being a static, one-time-loaded population — the journey ' s Contact Evaluation setting must be configured to ' Evaluate new records only, ' which ensures Journey Builder only evaluates and processes rows that are newly added to the data extension since the last evaluation cycle, correctly picking up each day ' s newly-added payment-reminder subscribers without repeatedly re-processing or re-sending to records that were already added and evaluated on prior days. Setting this to ' Evaluate all records ' (option C) would cause the journey to re-evaluate the entire historical dataset on every cycle, risking duplicate sends to subscribers who were already processed and potentially already received their reminder, which directly undermines correct, one-time-per-cycle processing of a continually-growing data extension. Journey Settings around ' re-entry ' (option D) govern whether the same contact can enter the journey again after completing or exiting a previous run — a related but distinct concern from which specific rows in a growing data extension get evaluated in the first place. Option B ' s ' Use email attribute from Contacts ' setting concerns how the recipient ' s email address is resolved, not which records are evaluated for entry. Reference: Journey Builder Contact Evaluation Settings, Data Extension Entry Sources.