Which statement about fiber optic cables and EMI is true?

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The main idea is that fiber optic cables carry information as light, not electricity. Because the signal travels through glass or plastic as photons, electromagnetic interference in the surrounding environment doesn’t create currents in the fiber to disturb the signal. The fiber itself is largely immune to EMI; any EMI effects come from the transmitter or receiver electronics at the ends, not from the fiber medium.

That’s why the statement that fiber optic cables are not susceptible to EMI is the best description: the interference simply doesn’t couple into the light signal traveling through the fiber. The other options either mischaracterize the need for shielding, or claim EMI has no impact at all on data transmission, which isn’t accurate when you consider interference can affect the electronic equipment involved rather than the fiber itself.