Which two items must be provided by the user to add an external data source to a data object? (Choose Two)

Which two items must be provided by the user to add an external data source to a data object? (Choose Two)
A . The authenticating information, if required by the corresponding service
B . A data transform to map the application data model to the connector
C . A simulated data source to test the implementation
D . The uniform resource identifier that identifies the web service

Answer: A, D