An online retailer needs to regularly process large product catalogs, which are handled in batches. These are sent out to be processed by people using theAmazon...

An online retailer needs to regularly process large product catalogs, which are handled in batches. These are sent out to be processed by people using theAmazon Mechanical Turk service, but the retailer has asked its Solutions Architect to design a workflow orchestration system that allows it to handle multiple concurrent Mechanical Turk operations, deal with the result assessment process, and reprocess failures.
Which of the following options gives the retailer the ability to interrogate the state of every workflow with the LEAST amount of implementation effort?