The correct answers are C and E. Option C is correct because serverless applications on AWS, such as AWS Lambda, are designed with built-in fault tolerance. AWS manages the infrastructure and automatically handles data replication and failure recovery without user intervention. Option E is also correct as serverless applications can automatically scale based on the incoming workload. Services like AWS Lambda and Amazon API Gateway manage the scaling process to accommodate varying traffic patterns, ensuring that the application can handle demand without manual intervention. Options A, B, and D are incorrect because serverless computing abstracts away the infrastructure management, including EC2 instances, and does not require manual configuration or the choice of operating systems. Additionally, serverless applications do not involve running EC2 Spot Instances, as they are not tied to specific EC2 instances.