In Databricks, what is the difference between `trigger(processingTime='10 seconds')` and `trigger(once=True)` in Structured Streaming?
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A
`processingTime` runs one batch every 10 seconds continuously; `once` processes all available data in a single batch then stops
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B
`processingTime` stops after 10 seconds; `once` runs indefinitely
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C
Both produce the same result but `once` is faster
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D
`processingTime` is for Kafka sources only; `once` is for file sources