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A DevOps engineer is tasked with finding the most cost-effective method to set up an image batch processing cluster on AWS. The application, which cannot be containerized and must operate on Amazon EC2 instances, requires checkpoint data to be stored on an NFS volume. The batch processing job is designed to handle interruptions. Preparing the cluster software from a standard EC2 Linux image involves a 30-minute configuration process. Considering these factors, what is the most economical solution for deploying this batch processing cluster?