Which AWS Service can help refactor and manage the state machine?

A current architecture uses many Lambda functions invoking one another as a large state machine. The coordination of this state machine is legacy custom code that breaks easily.

Which AWS Service can help refactor and manage the state machine?
A . AWS Data Pipeline
B . AWS SNS with AWS SQS
C . Amazon Elastic MapReduce
D . AWS Step Functions

Answer: D

Explanation:

Reference: https://docs.aws.amazon.com/step-functions/latest/dg/tutorial-creating-lambda-statemachine.html