单选题 Which of the following description is WRONG about Wi-Fi? __________ 的答案

Communications between two devices need the involvement of an access point with WI-Fi.

One can connect Wi-Fi devices in ad-hoc mode for client-to-client connections without a router.

Now most laptops are built with wireless network adapters inside.

Any standard Wi-Fi device will work anywhere in the world with global operative set of standards.