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Answer: Both batch and streaming
When employing a BigQueryIO.Write transform in batch mode for writing to a single table, Dataflow initiates a BigQuery load job. Conversely, when using a BigQueryIO.Write transform in streaming mode or in batch mode with a function to define the destination table, Dataflow leverages BigQuery's streaming inserts. For more details, refer to: https://cloud.google.com/dataflow/model/bigquery-io
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