Answer: Amazon EC2

## Explanation Amazon EC2 (Elastic Compute Cloud) is an Infrastructure as a Service (IaaS) offering where customers have full control over the operating system and are responsible for: - Applying operating system patches - Security updates - Application patches - Operating system configuration **Why the other options are incorrect:** - **Amazon DynamoDB**: A fully managed NoSQL database service where AWS handles all patching, maintenance, and scaling - **AWS Lambda**: A serverless compute service where AWS manages the underlying infrastructure, including operating system patches - **AWS Fargate**: A serverless compute engine for containers where AWS manages the underlying infrastructure and operating system In the **Shared Responsibility Model**, Amazon EC2 falls under the customer's responsibility for operating system management, while the other services are fully managed by AWS.

Author: Ritesh Yadav