Communication devices that do not use electrical wiring for signal transmission can use _____.

• A. A & B
• B. Fiber optic
• C. Wireless
• D. None of the above

Answer: (A)

Non-wired signal transmission can be achieved using either fiber optic methods or wireless methods. Fiber optic uses light traveling through glass or plastic fibers to carry information, so there’s no electrical wiring involved in the data path. Wireless transmits signals through the air using radio waves or other non-contact means, again avoiding physical signal wires. Since both options meet the criterion of not using electrical wiring for the signal, the choice that includes both fiber optic and wireless is the best fit. None of the above would be incorrect because there are viable non-wired methods.