Routers A and B are connected with a point-to-point OC-3 interface. Each router's OC-3 interface is configured for both Level 1 and Level 2. The routers are configured in the same area. How many IS-IS adjacencies exist between the two routers?（）
- A、0
- B、1
- C、2
- D、3
正确答案:C
答案解析:有
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