Explanation

AWS Step Functions is the correct answer because it is specifically designed as a low-code, visual workflow service that allows developers to build distributed applications by orchestrating AWS services into serverless workflows.

Key Features of AWS Step Functions:

• Visual Workflow Designer: Provides a graphical interface to build and visualize workflow logic
• Low-Code Approach: Reduces the amount of code needed to coordinate multiple AWS services
• State Management: Handles error handling, retries, and parallel processing automatically
• Distributed Application Coordination: Coordinates components across multiple AWS services like Lambda, ECS, SNS, etc.

Why Other Options Are Incorrect:

• AWS Config: A service for assessing, auditing, and evaluating AWS resource configurations - not for workflow orchestration
• AWS Lambda: A serverless compute service for running code without provisioning servers - while it can be part of workflows, it doesn't provide visual workflow design
• Amazon CloudWatch: A monitoring and observability service for AWS resources and applications - focused on metrics, logs, and alarms, not workflow orchestration

AWS Step Functions enables developers to build resilient workflows with built-in error handling, making it ideal for distributed applications that require coordination between multiple services.