A customer wants to import the previous 10 years of customer purchase data in their...

At a scale of over 200 million records ingested via REST API with continued ongoing growth, two technical dimensions become critical discovery points that directly affect architecture and licensing decisions. First, understanding the expected peak hourly API call volume (A) is essential because Marketing Cloud enforces API rate limits per account, and a sustained high-volume REST API ingestion pattern at this scale risks hitting those limits, requiring the consultant to plan for request batching, throttling, or an alternative bulk-ingestion pattern if peak rates would exceed platform thresholds. Second, confirming whether the customer ' s license includes the Large Data Extensions feature (C) is essential because standard data extensions have documented row-count and storage limitations that 200 million records with continued growth would likely exceed, making this licensing entitlement a hard architectural prerequisite rather than an optional nice-to-have. What time of day API calls are made (B) is a much less consequential detail than the peak volume itself, since Marketing Cloud ' s rate limits are not meaningfully time-of-day-dependent in a way that changes architecture. Why the customer requires 10 years of data (D) is a business-justification question, not a technical discovery question that shapes the actual implementation architecture. Reference: Marketing Cloud API Rate Limits, Large Data Extensions.