Explanation

AWS Fargate and AWS Lambda are serverless services:

• AWS Fargate: A serverless compute engine for containers that works with both Amazon ECS and Amazon EKS. You don't need to provision or manage servers - AWS manages the underlying infrastructure.

• AWS Lambda: A serverless compute service that runs your code in response to events and automatically manages the underlying compute resources.

Why the other options are NOT serverless:

• AWS Outposts: Brings AWS infrastructure and services to your on-premises data center - requires you to manage physical infrastructure
• Amazon EC2: Requires provisioning and managing virtual servers (instances)
• Amazon EKS: While EKS can use Fargate for serverless operation, EKS itself typically requires managing Kubernetes control plane and worker nodes

Serverless services eliminate infrastructure management and automatically scale based on demand.