The correct option is Define a Step Functions state machine using Amazon States Language. This option names the workflow specification that AWS Step Functions executes.

AWS Step Functions workflows are written as state machines in the JSON-based Amazon States Language. A state machine definition describes each step and the transitions and it coordinates Lambda function invocations as well as branching, retries, and error handling, so the developer must author that definition to express the workflow logic.

Invoke StartExecution to begin a workflow run is incorrect because StartExecution only starts an execution of an already defined state machine and it does not create the workflow definition.

Deploy the orchestration with an AWS CloudFormation YAML template is incorrect because CloudFormation can provision an AWS::StepFunctions::StateMachine resource but you still must provide the Amazon States Language definition, so CloudFormation alone does not author the workflow logic.

Amazon EventBridge is incorrect because EventBridge is an event bus for routing events and it does not provide the stateful, step-by-step orchestration that Step Functions offers.

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