What Is Wireless Fidelity (Wi-Fi)

What is wireless fidelity (Wi-Fi) ?

A) a metropolitan area network that uses radio signals to transmit and receive data
B) a communications technology aimed at providing high-speed wireless data over metropolitan area networks
C) a means by which portable devices can connect wirelessly to a local area network, using access points that send and receive data via radio waves
D) includes the inner workings of a Wi-Fi service or utility, including the signal transmitters, towers, or poles and additional equipment required to send out a Wi-Fi signal