The correct choice is Amazon Rekognition. It is consumed as a fully managed application through APIs so VistaPixels does not operate servers or maintain runtimes and this aligns with the Software as a Service model.

Amazon Rekognition provides prebuilt image and video analysis features that you call via API and AWS handles the underlying infrastructure the models and the runtime environment so the startup only sends images and receives analysis results. This removes the need to provision instances manage operating systems or patch runtimes which matches SaaS expectations.

AWS Elastic Beanstalk is not correct because it is a Platform as a Service that orchestrates infrastructure and application components while you still deploy and manage your application code and environment settings.

Amazon Elastic Compute Cloud (Amazon EC2) is not correct because it is Infrastructure as a Service where you control the virtual servers the operating system and any installed software and updates.

AWS Lambda is not correct because it is serverless compute or Function as a Service where you provide function code and manage integrations and configuration rather than consuming a complete provider operated software product.

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