A company needs to optimize the cost of its application on AWS.

A company needs to optimize the cost of its application on AWS. The application uses AWS Lambda functions and Amazon ECS containers that run on AWS Fargate. The application is write-heavy and stores data in an Amazon Aurora MySQL database.

The load on the application is not consistent. The application experiences long periods of no usage, followed by sudden and significant increases and decreases in traffic. The database runs on a memory optimized DB instance and has high utilization during peak times. A solutions architect must design a solution that can scale to handle the changes in traffic.

Which solution will meet these requirements MOST cost-effectively?