Carrie is a network technician developing the Internet Protocol $($IP$)$ addressing roadmap for her company. While IP version $4($IPv$4)$ has been the standard for decades, IP version $6($IPv$6)$ can provide a much greater number of unique IP addresses. Which addressing system should she designate for primary use on her roadmap and why?

IPv$6$ is rapidly replacing IPv$4$ worldwide. She should make IPv$6$ the primary addressing scheme in her roadmap.

IPv$6$ is only slowly being adopted. She should make IPv$4$ the primary addressing scheme in her roadmap until IPv$6$ is more widely adopted.

Few commercial businesses still use IPv$4.$ She should feature IPv$6$ strongly in her roadmap rather than have her company fall behind technologically.

There will be adequate IPv$4$ addresses available well into the future. She should make IPv$4$ the primary addressing scheme.