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Design a data processing pipeline that automatically scales with increasing load, ensures at-least-once message processing, and maintains message order within 1-hour windows. Which combination of technologies would you choose?
A
Use Apache Kafka for message ingestion and Cloud Dataflow for streaming analysis.
B
Utilize Apache Kafka to ingest messages and Cloud Dataproc for streaming analysis.
C
Use Cloud Pub/Sub for message ingestion and Cloud Dataflow for streaming analysis.
D
Use Cloud Pub/Sub for message ingestion and Cloud Dataproc for streaming analysis.