Amazon Exam AWS-Solution-Architect-Associate Topic 15 Question 4 Discussion

A Solutions Architect is designing a three-tier web application that will allow customers to upload pictures from a mobile application, The application will then generate a thumbnail of the picture and return a message to the user confirming that the image was successfully uploaded. Generation of the thumbnail may take up to 5 seconds. To provide a subsecond response time to the customers uploading the images, the Solutions Architect wants to separate the web tier from the application tier.

Which service would allow the presentation tier to asynchronously dispatch the request to the application tier?