Answer: Amazon EventBridge

## Explanation Amazon EventBridge is the correct service for this requirement because: - **EventBridge** is an AWS serverless event bus service that helps you connect applications using data from your own applications, integrated Software-as-a-Service (SaaS) applications, and AWS services - It can monitor AWS service events, including EC2 instance state changes - When an EC2 instance transitions to the RUNNING state, EventBridge can detect this event and trigger a Step Functions workflow - This provides a decoupled, event-driven architecture where the EC2 state change automatically initiates the workflow without manual intervention **Why the other options are incorrect:** - **Amazon SageMaker**: A machine learning service for building, training, and deploying ML models - **Amazon Connect**: A cloud-based contact center service - **AWS Fargate**: A serverless compute engine for containers that works with Amazon ECS and EKS EventBridge is specifically designed for event-driven architectures and can integrate with Step Functions to automate workflows based on AWS service events.

Author: Ritesh Yadav