A router is running the IS-IS, the output information shown in the figure, which of the following statements is true?

A router is running the IS-IS, the output information shown in the figure, which of the following statements is true?

A . The period of the s4/0/0 interface sending llH is 30s
B . The circuit-leve1 of the s4/0/0 interface is Level-1
C . The Cost value of the s4/0/0 interface is 20
D . s4/0/0 interface supports IPv6

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Answer: B