Which option is a primary requirement for the deployment of an IPv6-enabled network via the native method (dual-stack model) within the enterprise campus environment?
A. hardware-based switching support for IPv6 forwarding on all campus switches
B. restriction of IPv6-enabled devices to the core layer
C. manual implementation of tunneling between IPv6-incompatible devices in an IPv4-over-IPv6 tunnel
D. disabling of multicast in the distribution layer prior to implementation of IPv6
