You are using an AWS CodePipeline to create a CloudFormation stack. The stack is used to deploy resources for a human approval project that allows the execution of a state machine to pause during a task. The workflow continues to the next state once the user has approved the task. In the CloudFormation template, there are already resources including Lambda functions that send email links for approval, an API Gateway endpoint that triggers Lambda functions and an SNS topic that sends an email for approval. What is another key resource that needs to be created in the template?

Answer options:

A.A state machine resource created in the type of AWS::StepFunctions::Activity.
B.A SWF state machine resource configured in AWS::SWFFunctions::StateMachine.
C.A Step Function resource created in the type AWS::StepFunctions::StateMachine.
D.A SWF resource in the CloudFormation type AWS::SWFFunctions::Activity.

Correct Answer – C
In this question, the workflow progresses to the next state after the user has approved the task. It can be implemented with a state machine. For an example of creating a human approval project, check the document in
https://docs.aws.amazon.com/step-functions/latest/dg/tutorial-human-approval.html.
Option A is incorrect: Because for Step Function state machine resources in CloudFormation template, the correct type should be AWS::StepFunctions::StateMachine. The reference is in
https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-stepfunctions-statemachine.html.
Option B is incorrect: Because there are no such type AWS::SWFFunctions. SWF is not supported in CloudFormation.
Option C is CORRECT: Because the Step Function state machine is a key resource in this case which achieves the feature of manual approval during a running task.
Option D is incorrect: Similar reason as option
B.