You have a legacy application that works via XML messages. You need to place the application behind the API gateway for customers to make API calls. Which of the following would you need to configure?

Answer options:

A.Enable Payload compression.
B.You will need to work with the Request and Response Data mapping.
C.Enable CORS.
D.Enable multiple stages.

Answer - B
This is also mentioned in the AWS Documentation.
For example, suppose that an API has an application/json template defined for a request payload and has an application/xml template defined for the response payload. If the client sets the "Content-Type : application/json", and "Accept : application/xml" headers in the request, both the request and response payloads will be processed with the corresponding mapping templates. If the Accept:application/xml header is absent, the application/xml mapping template will be used to map the response payload. To return the response payload unmapped, you must set up an empty template for application/json.
Since the documentation clearly mentions what should be the way to handle such requests, all other options are incorrect.
For more information on request-response data mappings, please refer to the below URL-
https://docs.aws.amazon.com/apigateway/latest/developerguide/request-response-data-mappings.html