You are designing a data processing pipeline. The pipeline must be able to scale automatically as load increases. Messages must be processed at least once and must be ordered within windows of 1 hour. How should you design the solution?

A. Use Apache Kafka for message ingestion and use Cloud Dataproc for streaming analysis. B. Use Apache Kafka for message ingestion and use Cloud Dataflow for streaming analysis. C. Use Cloud Pub/Sub for message ingestion and Cloud Dataproc for streaming analysis. D. Use Cloud Pub/Sub for message ingestion and Cloud Dataflow for streaming analysis.