Which statement best describes what a flexible IPv6 strategy would look like for this corporation?

A global corporation has an internal network with the following characteristics:

Which statement best describes what a flexible IPv6 strategy would look like for this corporation?

A.
Both hosts and routers would run dual stack

B.
Hosts would run IPv4 and routers would run native IPv6

C.
Hosts would run dual stack and routers would run IPv4 only

D.
Hosts would run IPv6 and routers would run native IPv6

Explanation:
Dual-stack is the preferred, most versatile way to deploy IPv6 in existing IPv4 environments. IPv6 can be enabled wherever IPv4 is enabled along with the associated features

required to make IPv6 routable, highly available, and secure. In some cases, IPv6 is not enabled on a specific interface or device because of the presence of legacy applications or hosts for which IPv6 is not supported. Inversely, IPv6 may be enabled on interfaces and devices for which IPv4 support is no longer needed.
Link: http://www.cisco.com/en/US/docs/solutions/Enterprise/Campus/CampIPv6.html#wp389920