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✔️ A. Use a wildcard in the filename Since the files include a timestamp, you can't hardcode the file name. You must use a wildcard (e.g., transactions_*.csv) in the S3 file path during setup to ensure all timestamped files are ingested. ✔️ D. Use "Upsert" refresh mode Upsert allows the system to ingest new or updated records incrementally from each file, without wiping previous data. This is necessary for daily uploads where each file contains only the last 24 hours of data. ❌ Why the others are incorrect: B. Deletion of old files This is managed on the S3 side, not by Data Cloud. There's no need to configure this in the data stream. C. Full Refresh Incorrect because Full Refresh replaces all data with each new file. This would delete prior days’ records — not what you want in a cumulative ingestion model.