You are planning to implement dual stack of IPv$4$ and IPv$6$ in your network. Currently, your network consists of servers, routers, and switches that have not been upgraded for several years. You are still running the Windows Server $2003.$ When implementing dual stack, which of the following will be your primary concerns? $[$Choose all that apply$].$

Ensuring the same service$-$levels for the dual stack

Ensuring that Internet Service Providers $($ISPs$)$ work with IPv$6$

Keeping the hardware and software costs under control

Ensuring that the hardware and software support the implementation