You are designing a cloud-native application that needs to execute batch processing jobs which could run for several hours. These jobs must be fault-tolerant and recover gracefully from failures. What is the most suitable GCP service to use for these batch processing jobs?

*Explanation:* For long-running, fault-tolerant batch processing jobs that may run for several hours, the most suitable GCP service is **Cloud Dataflow with fault-tolerance enabled**. Cloud Dataflow is designed for precisely this use case, providing fault-tolerance and graceful recovery from failures. Other options like App Engine Standard (not designed for long-running jobs), Compute Engine with preemptible instances (not suitable for long-running processes), Kubernetes Engine with StatefulSets (generally not used for batch processing jobs), and Cloud Run with maximum concurrency set to 1 (not designed for long-running tasks) are not as well-suited for this specific scenario.