When IPv6 is deployed by a Service Provider to bring on an IPv6 Enterprise， which transition strategyworks the best？（）
- ADeploy IPv6 at the Edges and tunnel Enterprise through the core
- BDeploy IPv6 at Edges and Core at the same time for smooth transition
- CDeploy IPv6 at the core first and then move to Edges toward the end customer
- DNone of the above will work