If a fire occurs in an electric cable, in which the inner layers of insulation, or the insulation covered by armor is burning, you should __________.

Correct Answer: Option D — all of the above

Deep-seated cable fires require isolating the energy source to prevent reignition and further damage. Cutting the cable and separating the ends ensures the circuit is fully de-energized and allows for direct application of extinguishing agents to the burning insulation, which is essential for effective suppression of internal combustion.