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The main idea here is identifying which part of the NEC governs distribution equipment like switchboards, panelboards, and the switchgear that protects and controls circuits. The reference that covers these is Article 408. It specifically sets the scope, construction, installation, and protection requirements for switchboards and panelboards (and the associated switching devices), including enclosures, busbars, overcurrent devices, mounting clearances, wiring methods, and related aspects. That focused coverage is what makes Article 408 the correct choice.

The other references address topics different from distribution equipment—one relates to calculating branch-circuit and feeder loads (often for lighting, including dwelling unit loads), another pertains to electrical signs or related devices, and another covers service conductors and service equipment considerations. Since they don’t directly govern switchboards, panelboards, and switchgear, they aren’t applicable here.