What are the parts of the underground cable?

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Underground cables are built in layered form: a conducting core made of stranded conductors, wrapped with insulation to prevent current leakage and provide the voltage rating, often with polyethylene as part of the dielectric insulation, then a metallic shield around the insulated conductors for fault current path and shielding, and finally an outer jacket that protects against moisture, soil chemicals, and physical damage. That combination—stranded conductors, insulation, polyethylene, metallic shield, and jacket—captures all the typical parts found in underground cables, so this option is the best fit. The other choices miss one or more essential elements like the conductor, the shield, or the insulation.