According to this picture, we can judge:

According to this picture, we can judge:

A . The system ID of R1 is ee8c.a0c2.bafl
B . R1 has both leve1-1 and level-1-2 link state information
C . R1 only has link state information for leve1-2
D . In the leve1-2 network, there are a total of 8 routers

Answer: A

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