Which of the following is often used to transmit data over long distances in audio-visual applications?

Fiber optic cable is the best choice for transmitting data over long distances in audio-visual applications due to its ability to carry large amounts of data at very high speeds with minimal loss of signal quality. This technology uses light to transmit information, which allows for greater bandwidth and the ability to cover longer distances without the degradation that occurs with electrical signals in conventional copper cables.

In addition to its high data capacity, fiber optic cables are immune to electromagnetic interference, which is crucial in environments where multiple devices are in operation. This makes them particularly suitable for complex AV setups, ensuring that the integrity of the signal is maintained even over extensive runs. The durability and resistance to environmental factors also contribute to fiber optics being a preferred choice for many modern AV installations.

Other cable types, while useful in specific contexts, do not match the performance characteristics of fiber optic cables for long-distance data transmission.