Answer: Enable RDS Proxy on the RDS DB instance.

## Explanation **Correct Answer: B - Enable RDS Proxy on the RDS DB instance** **Why this is the correct solution:** 1. **RDS Proxy is specifically designed for this scenario** - It acts as a connection pool for RDS databases, managing and reusing database connections efficiently. 2. **Addresses connection timeout issues** - During peak traffic, Lambda functions can create too many concurrent connections to the RDS database, overwhelming it. RDS Proxy pools connections and reuses them across Lambda invocations. 3. **Minimal code changes** - RDS Proxy requires minimal code changes. You just need to point your application to the RDS Proxy endpoint instead of the direct RDS endpoint. 4. **Handles unpredictable traffic** - RDS Proxy helps manage connection spikes by pooling connections and preventing database overload. 5. **Serverless-friendly** - RDS Proxy is designed to work well with serverless applications like Lambda, where functions can scale rapidly and create many short-lived connections. **Why the other options are incorrect:** - **A. Reduce the Lambda concurrency rate**: This would limit the application's ability to handle traffic and doesn't solve the underlying connection management issue. - **C. Resize the RDS DB instance class**: While this might help temporarily, it doesn't address the fundamental connection management problem and could be expensive. The issue is connection management, not necessarily instance capacity. - **D. Migrate the database to Amazon DynamoDB**: This would require significant code changes and database migration, which contradicts the requirement for "least amount of change to the code." While DynamoDB is serverless and scales well, migration is a major architectural change. **Key Benefits of RDS Proxy:** - Connection pooling and reuse - Reduced database load from connection establishment - Improved application scalability - Enhanced security with IAM authentication - Failover support for high availability - Minimal code changes required

Author: LeetQuiz Editorial Team