You're designing a large-scale data processing pipeline in GCP. You have streaming data that must be analyzed in real-time, and you also have large batch datasets. You're looking for a unified programming model for both cases. What GCP service would be the most appropriate for this?

*Explanation:* If you need a unified programming model for both real-time streaming and batch data processing in GCP, the ideal choice is **Cloud Dataflow**. Cloud Dataflow provides capabilities for both batch and stream processing under a unified programming model, allowing you to seamlessly analyze streaming data and large batch datasets within the same pipeline. This simplifies development and maintenance, making it an efficient choice for your data processing needs. The other options involve multiple services and may not provide the same level of integration and ease of use.