Which command enables IPv6 forwarding on a Cisco router?

A.
ipv6 local

B.
ipv6 host

C.
ipv6 unicast-routing

D.
ipv6 neighbor

Explanation:
http://www.ciscopress.com/articles/article.asp?p=31948&seqNum=4
The first step of enabling IPv6 on a Cisco router is the activation of IPv6 traffic forwarding to forward
unicast IPv6 packets between network interfaces. By default, IPv6 traffic forwarding is disabled on
Cisco routers. The ipv6 unicast-routing command is used to enable the forwarding of IPv6 packets
between interfaces on the router. The syntax for this command is as follows: Router(config)#ipv6
unicast-routing The ipv6 unicast-routing command is enabled on a global basis.