Refer to the exhibit. An engineer is configuring multitopology IS-IS for IPv6 on router R1. Which additional configuration must be applied to the router to complete the task?
A. R1# configure terminal R1(config)# router isis area2 R1(config-router)# address-family ipv6 R1(config-router-af)# multi-topology
B. R1# configure terminal R1(config)# router isis area1 R1(config-router)# metric-style wide level-2 R1(config-router)# address-family ipv6 R1(config-router-af)# multi-topology
C. R1# configure terminal R1(config)# router isis area2 R1(config-router)# metric-style wide R1(config-router)# address-family ipv6 R1(config-router-af)# multi topology
D. R1# configure terminal R1(config)# router isis area1 R1(config-router)# metric-style wide level-1 R1(config-router)# address-family ipv6 R1(config-router-af)# multi topology
Correct Answer: A