Which of the following is NOT true with Li－Fi？A．Products involving it already exist.B．It m

Which of the following is NOT true with Li-Fi？

A．Products involving it already exist.

B．It may become an alternative to Wi-Fi.

C．It can exacerbate the problem of capacity.

D．The speed of it already exceeds some of the Wi-Fi routers.

请帮忙给出正确答案和分析，谢谢！