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Thebuilding envelope consists of exterior components that separate the interior from external conditions.TheIFMA Building Systems competencydefines the building envelope asexterior walls, roof, windows, and doors. * Option B is correctas it includesall structural components that protect the interior environment. * Option A (Stairways)are part of theinterior structure, not the envelope. * Option C (Corridors and circulation spaces)areinside the building. * Option D (Electrical and mechanical areas)arefacility components but not part of the envelope. Thebuilding envelope affects energy efficiency, insulation, and structural integrity.