問題文
A factory sends one faulty drive away under warranty and will never get that particular drive back, and has another drive mended on its own floor while its own staff watch. The factory has to say which of the two sits outside its control. It also has to record how many sources it draws on to learn which handheld devices are actually in use. Which pair fits the two drives and that count?
選択肢
- a part sent away for good sits outside the control while a part mended on site stays inside it, and the picture of the devices is drawn from 3 sources.
- a part sent away for good sits outside the control while a part mended on site stays inside it, and the picture of the devices is drawn from 2 sources.
- a part mended on site sits outside the control while a part sent away for good stays inside it, and the picture of the devices is drawn from 2 sources.
- a part mended on site sits outside the control while a part sent away for good stays inside it, and the picture of the devices is drawn from 3 sources.