A Developer Is Refactoring a Monolithic Application

Multiple Choice

A developer is refactoring a monolithic application. The application takes a POST request and performs several operations. Some of the operations are in parallel while others run sequentially. These operations have been refactored into individual AWS Lambda functions. The POST request will be processed by Amazon API Gateway. How should the developer invoke the Lambda functions in the same sequence using API Gateway?

A) Use Amazon SQS to invoke the Lambda functions
B) Use an AWS Step Functions activity to run the Lambda functions
C) Use Amazon SNS to trigger the Lambda functions
D) Use an AWS Step Functions state machine to orchestrate the Lambda functions