A network administrator is migrating from IPv4 to IPv6 and one of the IS-IS adjacencies is not coming up between R1 and R2.
Which action will solve the problem?
A. Remove topologies ipv6-unicast from protocols isis on R2.
B. Configure topologies ipv4-unicast from protocols isis on R2.
C. Remove topologies ipv6-unicast from protocols isis on R1.
D. Configure an IPv4 address on interface ge-0/0/1 on R1.