Which type of media uses electromagnetic waves that are generated by lasers, is often used in campus backbones, and is capable of transmitting to a distance of 60 kilometers?

Which type of media uses electromagnetic waves that are generated by lasers, is often used in campus backbones, and is capable of transmitting to a distance of 60 kilometers?
A. shielded twisted-pair cable
B. coaxial cable
C. multimode fiber-optic cable
D. single-mode fiber-optic cable

Answer: C

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