HTTP response codes in SAP Emarsys API indicate call status:
* Option A:Correct. A 400 Bad Request means the request contains invalid data (e.g., syntax error, missing parameters) that needs correction.
* Option B:Incorrect. Internal issues return a 500-series code, not 400.
* Option C:Incorrect. Incorrect credentials typically return a 401 Unauthorized, not 400.
* Option D:Incorrect. Success is a 200 OK, not 400.The SAP Emarsys API Documentation defines 400 as a client-side error.References:SAP Emarsys API Documentation - "Response Codes" (https://dev.
emarsys.com/).