You are developing a migration plan to enable IPv6 in your IPv4 network. Starting at R3 and assuming default IS-IS operations, what is likely to happen when you enable IPv6 routing on the link from R3 to R2?

Refer to the exhibit.

You are developing a migration plan to enable IPv6 in your IPv4 network. Starting at R3 and assuming default IS-IS operations, what is likely to happen when you enable IPv6 routing on the link from R3 to R2?
A . Only R3 and R2 have IPv4 and IPv6 reachability.
B . R2 receives an IPv6 default route from R3.
C . Loopback reachability between all routers for IPv4 is lost.
D . All routers except R2 are reachable through IPv4.
E . R3 advertises the link from R3-R2 to R1, R4 and R5 only.

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Answer: C