A media company runs a content-processing application on a fleet of EC2 instances that share files through an Amazon EFS file system. Most of the day the workload is light, but several times a week batch rendering jobs generate large, unpredictable spikes in throughput that far exceed the baseline. During these spikes, users report that file operations become slow because the file system exhausts its burst credits. The team wants a solution that automatically delivers high throughput during unpredictable spikes without provisioning a fixed capacity or managing credits. Which approach best meets these requirements?