What does a fire resistance rating of '2-hour' for a wall assembly mean according to ASTM E119?
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A
The wall can withstand flames for 2 hours before igniting
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B
The assembly withstands the standard fire test exposure for 2 hours without failure of load, integrity, or insulation criteria
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C
The wall must be inspected every 2 hours during a fire
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D
The wall reduces smoke density by 50% over 2 hours