What technology do fiber-optic systems utilize?

Fiber-optic systems utilize light instead of electricity for data transmission, which is the correct answer. This technology transmits information in the form of light pulses through flexible glass or plastic fibers. The advantages of using light include higher data transmission rates, greater bandwidth, and reduced signal degradation over long distances compared to electrical signals used in traditional copper wiring. These characteristics make fiber optics particularly suitable for applications requiring high-speed internet and telecommunications.

In contrast, the other choices involve technologies that do not accurately describe fiber-optic systems. Electric signals relate to traditional communication methods using copper wiring, and radio waves are pertinent to wireless communication, while magnetic fields are used in various other types of processing or storage but are not relevant to fiber optics.