フリー問題

問題文

A payment platform exposes a public interface that other companies call from their own code. The team is planning how to test that interface. Which option names the aspect that this syllabus treats as often crucial when dealing with such an interface?

選択肢

1. coexistence testing, because programmers who reach a service through an interface may use it in ways for which it was never intended, so robust error handling becomes essential in the implementation
2. negative examination, because programmers who reach a service through an interface may use it in ways for which it was never intended, so robust error handling becomes essential in the implementation
3. installability testing, because programmers who reach a service through an interface may use it in ways for which it was never intended, so robust error handling becomes essential in the implementation
4. usability testing, because programmers who reach a service through an interface may use it in ways for which it was never intended, so robust error handling becomes essential in the implementation