AWS Certified Cloud Practitioner — Question 721

For which AWS service is the customer responsible for maintaining the underlying operating system?

Answer options

• A. Amazon DynamoDB
• B. Amazon S3
• C. Amazon EC2
• D. AWS Lambda

Correct answer: C

Explanation

Under the AWS Shared Responsibility Model, Amazon EC2 is an Infrastructure as a Service (IaaS) that requires the customer to perform all necessary security configuration and management tasks, including operating system patching. In contrast, Amazon DynamoDB, Amazon S3, and AWS Lambda are fully managed or serverless services where AWS handles the underlying infrastructure and OS maintenance.