What Is a Microwave Transmitter

What is a microwave transmitter?

A) A means of linking computers using infrared or radio signals
B) An omnidirectional wireless technology that provides limited-range voice and data transmission over the unlicensed 2.4-GHz frequency band, allowing connections with a wide variety of fixed and portable devices that normally would have to be cabled together
C) A technology that uses active or passive tags in the form of chips or smart labels that can store unique identifiers and relay this information to electronic readers
D) Uses the atmosphere (or outer space) as the transmission medium to send the signal to a microwave receiver