Answer: Amazon EC2

## Explanation Amazon EC2 (Elastic Compute Cloud) is the correct answer because it is an Infrastructure as a Service (IaaS) offering where customers have full control over the virtual machines, including the guest operating system. ### Key Points: - **Amazon EC2**: Customers are responsible for patching and maintaining the guest OS, security updates, and application software - **Amazon DynamoDB**: Fully managed NoSQL database service - AWS handles OS and infrastructure maintenance - **Amazon S3**: Fully managed object storage service - AWS handles all underlying infrastructure - **Amazon Aurora**: Fully managed relational database service - AWS handles OS patching and database maintenance ### AWS Shared Responsibility Model: - **AWS Responsibility**: Security **of** the cloud (infrastructure, hardware, software) - **Customer Responsibility**: Security **in** the cloud (guest OS, applications, data) For EC2 instances, customers must perform regular security patching of the operating system to maintain security compliance.

Author: Ritesh Yadav