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A developer is building a photo-sharing application that automatically enhances images uploaded by users to Amazon S3. When a user uploads an image, its S3 path is sent to an image-processing application hosted on AWS Lambda. The Lambda function applies the selected filter to the image and stores it back to S3. If the upload is successful, the application will return a prompt telling the user that the request has been accepted. The entire processing typically takes an average of 5 minutes to complete, which causes the application to become unresponsive. Which of the following is the MOST suitable and cost-effective option which will prevent the application from being unresponsive?