According to the information given in the figure, which of the following descriptions of the IPv6 routing information calculated by the R router through ISIS is correct?
A . R4 has no IS-IS routing entry
B . R4 has 2 equal-cost IS-IS default routes
C . R4 has 2 non-equivalent IS-1S default routes
D . R4 has 1 1S-IS default route
Answer: B
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