Which of the options A to D is not a medium of information transmission?

The option that is not a medium of information transmission is the television set. While it is true that a television set can display information that is transmitted through various mediums such as cable, satellite, and wireless transmission, the television set itself is not a medium of transmission. A cable is a physical wire or bundle of wires that transmit electrical signals carrying information. Satellite transmission uses signals sent from a satellite in space to receive and transmit data. Wireless transmission, on the other hand, uses electromagnetic waves to send and receive information without the use of physical wires. In summary, a television set is a device that displays information that is transmitted through various mediums, but it is not a medium of transmission itself.