A multi-step workflow must run a SageMaker job, wait for completion, then call another AWS service with defined retries. Which service is appropriate for cross-service orchestration?

1. An unbounded loop that restarts all completed side effects after every error.
2. A browser polling loop as the only durable execution state.
3. Step Functions with supported SageMaker integration and explicit error handling.
4. A Route 53 weighted record as the job completion dependency.