Which statement about fiber optic is correct?

Which statement about fiber optic is correct?

• A. Fiber optic cables carry electrical signals that are immune to EMI.
• B. Twisted pair is more expensive than fiber optic.
• C. Coaxial cables cannot carry digital data.
• D. Fiber optic uses light to transmit data and is immune to electrical interference.

Answer: (D)

Fiber optic transmission relies on light to move data through glass or plastic, so there are no electrical currents inside the fiber. Because of that, electromagnetic interference from nearby electrical devices doesn’t disrupt the signal, making fiber truly immune to EMI. The claim that fiber carries electrical signals is not accurate—it carries light. Twisted pair tends to be cheaper to install and work with than fiber, so saying it’s more expensive isn’t correct. Coaxial cables can carry digital data, such as Ethernet or cable modem signals, so that statement is also incorrect. In short, fiber uses light to transmit data and is immune to electrical interference.

Fiber optic transmission relies on light to move data through glass or plastic, so there are no electrical currents inside the fiber. Because of that, electromagnetic interference from nearby electrical devices doesn’t disrupt the signal, making fiber truly immune to EMI. The claim that fiber carries electrical signals is not accurate—it carries light. Twisted pair tends to be cheaper to install and work with than fiber, so saying it’s more expensive isn’t correct. Coaxial cables can carry digital data, such as Ethernet or cable modem signals, so that statement is also incorrect. In short, fiber uses light to transmit data and is immune to electrical interference.