A developer is creating a serverless orchestrator that performs a series of steps to processes incoming IoT data. The orchestrator transforms the data, performs a series of calculations, and stores the results in Amazon DynamoDB. The entire process is completed in less than a minute.
The orchestrator must process tens of thousands of transactions each second. The orchestrator must not miss a transaction and must process each transaction at least once.
Which solution will meet these requirements MOST cost-effectively?

A. Use Amazon Simple Notification Service (Amazon SNS) to process the data through an HTTP or HTTPS endpoint.
B. Use AWS Step Functions to process the data as Standard Workflows.
C. Use AWS Step Functions to process the data as Synchronous Express Workflows.
D. Use AWS Step Functions to process the data as Asynchronous Express Workflows.