AWS Certified Solutions Architect Professional SAP-C02 Practice Question
You are modernizing a claims-processing workflow that currently runs as a monolithic cron job on an on-premises server. For every new claim, the job performs three sequential actions:
- Validate the claim data.
- Call an external fraud-scoring API. The API responds asynchronously by sending an HTTPS callback within up to 3 hours. A duplicate call to the API generates an additional cost.
- Persist the fraud score in Amazon DynamoDB and notify the claimant.
The modernization design must meet these requirements:
- Replace the cron job with a fully managed, serverless orchestration service that minimizes custom code.
- Guarantee exactly-once execution of each fraud-scoring request.
- Pause the workflow until the external system returns the fraud score, without polling.
- Handle thousands of concurrent claims with minimal operational overhead and provide built-in execution history for auditing.
Which solution meets these requirements MOST cost-effectively?
Create an AWS Step Functions Standard workflow. Use a Task state that invokes a Lambda function to send the request to the external API and passes a task token. Configure the Task state with the Wait for Callback (
.waitForTaskToken) pattern so the workflow pauses until the external system returns the token through an API Gateway endpoint.Use Amazon EventBridge Scheduler to trigger an AWS Lambda function for each claim; store workflow state and callback information in DynamoDB, and resume processing when the Lambda function is reinvoked by the external system.
Create a Standard Step Functions workflow that uses the Run a Job (
.sync) integration pattern to invoke the external API with a 3-hour timeout.Create an AWS Step Functions Express workflow that invokes the external API synchronously and then uses a Wait state of 3 hours before persisting the result.