Northern Trail Outfitters wants to send a Marketing Cloud email immediately after the email address...

Salesforce Triggered Sends, configured through Marketing Cloud Connect, are declaratively set up on a Salesforce object and field using point-and-click Setup configuration (Triggered Send Definition mapped to a Salesforce workflow or process trigger on field change) — no Apex code is required. When the email address field on the Contact record changes, the configured trigger fires and Marketing Cloud sends the associated triggered email almost immediately, satisfying both the ' immediately after ' and ' without writing an APEX trigger ' constraints simultaneously. Journey Builder and Automation Studio (A) could theoretically be assembled to poll for changes, but that requires either a Salesforce Data Extension sync on a schedule (introducing latency, not immediacy) or a Salesforce Platform Event/Flow-based entry event, which is a heavier build than what ' s needed and isn ' t the direct, native answer to a simple field-change trigger. Salesforce Report Import (C) is a batch, schedule-driven mechanism entirely unsuited to real-time triggering. The Transactional Messaging API (D) is API-driven and requires an external system or Apex/Flow callout to invoke it — it is not itself a native, no-code response to a field change. Salesforce Triggered Send is precisely the declarative, native feature for this use case. Reference: Marketing Cloud Connect, Salesforce Triggered Sends.