Which statement correctly characterizes fiber optic cabling?

• A. Twisted pair uses copper and is low cost.
• B. Coaxial cable uses copper and shielding.
• C. Fiber optic uses light (glass or plastic) and is not interfered by electrical signals; high cost.
• D. Wireless networks use radio waves.

Answer: (C)

Fiber optic cabling transmits data by sending light through glass or plastic fibers. This light-based signaling makes the medium immune to electrical interference from nearby signals, so data integrity remains high even in electrically noisy environments. It also supports very high bandwidth and can carry signals over long distances with relatively low attenuation. The trade-off is higher upfront cost due to materials, precision manufacturing, and more complex installation and splicing.

That combination—uses light (glass or plastic), is not affected by electrical signals, and is typically more expensive—is what makes this description the best fit for fiber. Other statements describe copper-based media or wireless, which are valid for those technologies but not for fiber.