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How should an external object be designed to interface to the system?(a) It should interface to one subsystem.(b) It should interface to several subsystems.(c) It should interface to every subsystem.(d) It should interface to none of the subsystems.Một đối tượng bên ngoài nên được thiết kế như thế nào để giao tiếp với hệ thống? (a) Nó nên giao tiếp với một hệ thống con. (b) Nó nên giao tiếp với một số hệ thống con. (c) Nó nên gi

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