Which statement is true about the command ipv6 ospf 1 area 0?（）
- A It must be issued before the network command to enable the OSPF pr ocess for IPv6.
- B It must be issued after the network command to enable the OSPF process for IPv6.
- C It must be issued in router global configuration mode to enable the OSPF process for IPv6.
- D It must be issued in interface configuration mode to ena ble the OSPF process for IPv6.