A customer wants to create a 1:1 protection group with a DS3N-12 card. Which card slots would allow for a 1:1 protection?（）
- A、Slot 2 and Slot 4
- B、Slot 4 and Slot 6
- C、Slots 5 or 13 only
- D、Slot 16 and Slot 17
正确答案:D
答案解析:有
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