In the IS-IS IPv6 network shown in the figure, all routers have multi-topology enabled. The IPv6 address of the R4 Loopback0 interface is 2000::4/128. Configure "ipv6 summary 2000::64 level- 2" in…

In the IS-IS IPv6 network shown in the figure, all routers have multi-topology enabled. The IPv6 address of the R4 Loopback0 interface is 2000::4/128. Configure "ipv6 summary 2000::64 level- 2" in the R2 and R1 IS-IS processes. Configure "ipv6 import- route isis level-2 into level-1" in the R1, R2, and R3 IS-IS processes. By default, which of the following routers have a route entry for 2000::/64 in their routing table?