Correct Option: D

Martin Cooper (born December 26, 1928 in Chicago, Illinois, USA) is an American former Motorola vice president and division manager who in the 1970s led the team that developed the handheld mobile phone (as distinct from the car phone). Cooper was also the CEO and founder of ArrayComm, a company that works on smart antenna technology and wireless networks, and was the corporate director of Research and Development for Motorola. In 1973, when Motorola installed a base station to handle the first public demonstration of a phone call over the cellular network, the company was trying to persuade the Federal Communications Commission to allocate frequency space to private companies for use in the emerging technology of cellular communications. After some initial testing in Washington for the F.C.C., John F. Mitchell and his team, which included Martin Cooper, took the cellular phone technology to New York to demonstrate it to reporters and the public.