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?

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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