The correct answer isAbecause the application processes videos for5–30 minutes, must runmultiple jobs in parallel, and should have theleast operational overhead.Amazon ECS with AWS Fargateis a managed container solution that removes the need to provision and manage EC2 instances while still supporting longer-running parallel jobs. UsingAmazon SQS standard queuesdecouples the upload event from processing and provides a scalable buffer for incoming work.

With this design, Amazon S3 sends object-created notifications to the SQS queue whenever users upload videos. ECS services or tasks on Fargate can then consume messages from the queue and process videos independently. Auto scaling based onSQS queue depthensures the system increases task count when more videos arrive and decreases capacity when demand drops. This provides elasticity and efficient parallel processing with minimal infrastructure management.

Option B is incorrect because EC2-based scaling introduces more operational overhead than Fargate. Option C is incorrect because AWS Lambda has a maximum execution duration and is not appropriate for jobs that can run up to 30 minutes. Option D is also incorrect for the same reason; Lambda is not the best fit for this processing duration, and SNS does not provide the same durable queued work pattern as SQS for controlled parallel processing.

AWS best practices recommend usingevent-driven queues with containerized workersfor medium-duration processing jobs that need concurrency and minimal management. Therefore,S3 + SQS + ECS on Fargate with queue-based scalingis the best solution.