The right option is; C) The use of fiber optics to transmit a digital signal.
Explanation:
The use of fiber optics to transmit a digital signal would be the most reliable method for transmitting waves for communication.
Fiber optics are long, flexible glass or plastic strands that are arranged in bundles (known as optical cables). Fiber optics are used to transmit information (signals) as light pulses over long distances. This technology is mainly used for communication (such as in internet, telephone and cable television) because it can transmit large amounts of information at very high speed. Fiber optics can also be used to inspect the inner part of the body and in automotive industry.
