Option C is correct. The best practice in this scenario is to use RDS event notifications to trigger actions. By subscribing to RDS event notifications, you can send the data to an Amazon SQS queue, which can then fan out to multiple Amazon SNS topics. This setup ensures that the information is reliably and promptly distributed to multiple target systems. AWS Lambda functions can then be employed to handle the updates to these targets effectively. This approach allows for scalable, decoupled, and resilient system design.