A developer is using Amazon API Gateway as an HTTP proxy to a backend endpoint. There are three eparate environments development, testing, and production. Each environment has a corresponding stage n the API.
The developer needs to direct traffic to different backend endpoints for each of these stages without reating a separate API for each stage.
Which solution will meet these requirements?

A. Add a model to the API. Add a schema to differentiate the different backend endpoints
B. Create stage variables. Configure the variables in the HTTP integration request of the API.
C. Use API custom authorizers to create an authorizer for each of the different stages.
D. Update the integration response of the API to add different backend endpoint.