Which statement best describes common causes of insulation failure and prevention?

Which statement best describes common causes of insulation failure and prevention?

• A. Temperature and humidity have no effect on insulation.
• B. Insulation failure is caused by color coding mistakes only.
• C. External moisture alone causes insulation degradation; prevention by labeling.
• D. Heat, moisture, age, chemical exposure, and mechanical damage are common causes of insulation failure; prevent with proper enclosure, insulation, moisture barriers, and careful handling.

Answer: (D)