During the development stages of a serverless application, a developer is looking to test the request and response behavior as if the back-end was already implemented. What service feature should the developer use to create this simulated environment to validate the front-end integration?
Use AWS CloudFormation to provision mock integration resources
Employ AWS Step Functions to replicate the back-end logic
Leverage Amazon EventBridge to schedule mock events for the integration
Configure Amazon API Gateway mock integrations for simulating the necessary endpoints