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A developer is designing a new feature for an existing application that uses an AWS...

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A developer is designing a new feature for an existing application that uses an AWS Lambda function. The developer wants to test the Lambda function safely in development and testing AWS accounts before deploying the function to a production AWS account. The developer must be able to roll back the function if issues are discovered.

Which solution will meet these requirements with the LEAST operational overhead?

A.

Create new Lambda function versions and aliases for the development, testing, and production accounts. After successful testing, update the production alias to point to the function version. Roll back to the most recent stable version if issues are discovered.

B.

Deploy the Lambda function separately to the development, testing, and production accounts after testing the function in each environment.

C.

Use Lambda layers to separate the code and libraries for each AWS account and deploy the function with different layers.

D.

Use environment variables to differentiate development, testing, and production behavior.

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