Click the Exhibit button. Given the information shown in the exhibit, when creating 2 DS1 circuits, how many STS ports are used on the VT1.5 matrix at Node 1 as VT circuits and how many are used after using VT tunnels?（）
- A、2；0
- B、3；2
- C、3；5
- D、4；0
- E、6；0
- F、6；2
正确答案:C
答案解析:有
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