A company develops and maintains a web application using Amazon EC2 instances and an Amazon RDS for SQL Server DB instance in a single Availability Zone. The resources need to run only when new deployments are being tested using AWS CodePipeline. Testing occurs one or more times a week and each test takes 2-3 hours to run. A DevOps engineer wants a solution that does not change the architecture components. Which solution will meet these requirements in the MOST cost-effective manner?

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A. Convert the RDS database to an Amazon Aurora Serverless database. Use an AWS Lambda function to start and stop the EC2 instances before and after tests.
B. Put the EC2 instances into an Auto Scaling group. Schedule scaling to run at the start of the deployment tests.
C. Replace the EC2 instances with EC2 Spot Instances and the RDS database with an RDS Reserved Instance.
D. Subscribe Amazon CloudWatch Events to CodePipeline to trigger AWS Systems Manager Automation documents that start and stop all EC2 and RDS instances before and after deployment tests.

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