You create Microsoft Windows-based applications. You are creating an application that consumes both an internally developed Web service and an externally developed Web service. The application uses only some of the methods that both the Web services expose. You need to design an integration testing strategy for the application. You want to achieve this goal by using the minimum amount of programming effort. What should you test?

A.
All methods that are used by the application from the externally developed Web service

B.
All methods that are used by the application from the internally developed and externally developed Web services

C.
All methods that are exposed by the externally developed Web service

D.
All methods that are exposed by the internally developed and externally developed Web services