A team deploys a lightweight fraud-scoring model on a SageMaker Serverless Inference endpoint. Traffic is intermittent, but a partner integration has a strict requirement: the first request after an idle period must respond within 300 ms. During testing, the team observes that cold starts add 2-4 seconds of latency to the first invocation. They want to keep the serverless model but eliminate the cold-start latency for the initial requests. What should they configure?