Per NEC, interior cabling must use which kind of cables?

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The main idea is safety through proper certification. NEC requires interior cabling to be listed by a recognized testing laboratory for the specific use in a building. A listed cable has been evaluated for construction, fire performance, insulation, and electrical characteristics, and is approved for in-building installations. This ensures the cabling will meet the required safety and performance standards, reducing fire and electrical risk. Shielding or coax may be used in certain cases, but the universal NEC requirement is that the cabling be listed for the intended application. Using unlisted cables would not meet code because they haven’t undergone the necessary safety evaluations.