Answer: Implement loose coupling

## Explanation **Loose coupling** is the correct AWS architectural best practice that ensures one system component cannot negatively impact another component. ### Why Loose Coupling? - **Fault Isolation**: In loosely coupled systems, components are independent and communicate through well-defined interfaces - **Resilience**: Failure in one component doesn't cascade to other components - **Scalability**: Components can scale independently without affecting others - **Maintainability**: Components can be updated or replaced without disrupting the entire system ### Why Other Options Are Incorrect: - **Request throttling**: This manages API request rates but doesn't prevent component interdependencies - **Stateful service**: Stateful services actually create dependencies between components - **Automatic data backups**: This provides data protection but doesn't address component isolation ### AWS Implementation Examples: - Use SQS for asynchronous communication - Implement API Gateway with Lambda functions - Use S3 for data storage instead of direct database connections - Employ event-driven architectures with SNS/SQS Loose coupling is a fundamental principle in AWS Well-Architected Framework that promotes system resilience and fault tolerance.

Author: Ritesh Yadav