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Databricks Certified Data Engineer Professional · Databricks
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- Correct answer : C — Complete A . Append mode only writes new rows that will never change again, such as finalized windows once the watermark has passed, and it does not rewrite the full result table on each trigger. B . Update mode writes only the rows whose aggregate value changed since the last trigger, which is more efficient than a full rewrite but is not what this description asks for. C . Complete mode rewrites the entire result table to the sink after every trigger, which requires retaining full aggregation state indefinitely and matches the behavior described. D . Continuous is a low-latency processing mode, not an output mode, so it does not fit alongside append, update, and complete as an answer to this question.