What characteristic of fiber makes it immune to electrical noise?

The correct answer identifies fiber as a transmission medium, which is crucial in understanding its immunity to electrical noise. Fiber optic cables transmit data using light rather than electrical signals, which means they are inherently less susceptible to interference from electromagnetic noise that can affect traditional copper cabling.

The nature of fiber optics allows them to operate effectively in environments where electrical noise is prevalent because the light signals, as opposed to electrical signals, do not radiate electromagnetic interference. This characteristic makes fiber an ideal choice for high-speed data transmission in situations where maintaining signal integrity is crucial.

Other choices, while related to various properties of fibers, do not directly account for the immunity to electrical noise. Understanding the basis of fiber optics as a medium for transmitting data using light reinforces why it stands out in environments that would typically compromise the performance of other types of cabling.