Which AWS service is designed to meet these requirements?

Explanations:

AWS Step Functions is a low-code, visual workflow service that allows developers to build and orchestrate distributed applications. It provides a graphical console for defining and monitoring workflows, making it ideal for creating complex, distributed applications.

AWS Config is used for resource configuration tracking and compliance auditing, not for building or orchestrating distributed applications.

AWS Lambda is a compute service for running code in response to events without managing servers, but it lacks the visual workflow orchestration required for building distributed applications.

Amazon CloudWatch is used for monitoring and observability of AWS resources and applications, not for building or managing application workflows.