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B is correct: Update the current pipeline and provide the transform mapping JSON object.
This is the Google Cloud recommended way to transition between streaming pipeline versions without data loss: 1. Create a new subscription on the same Pub/Sub topic. 2. New subscription starts receiving messages from the moment of creation. 3. Create a new pipeline with this new subscription. 4. After validation, cancel the old pipeline and subscribe if necessary.
Please refer the google doc link below, https://cloud.google.com/dataflow/docs/guides/stopping-a-pipeline#drain