. $\square$ D. RJ-45 is not a network medium. Three primary types of physical media can be used: coaxial cable, twisted-pair cable, and fiber-optic cable. Transmission rates that can be supported on each of these physical media are measured in millions of bits per second (Mbps). RJ-45 is a connector type for twisted-pair cabling.
ख A, B, and C are incorrect because they are all common network media.