3987. The atmosphere in a tank is too rich when it is __________.

incapable of supporting combustion because the hydrocarbon vapor content makes the atmosphere below the LFL (Lower Flammable Level)
incapable of supporting combustion because the hydrocarbon vapor content makes the atmosphere above the UFL (Upper Flammable Limit)
in a noncombustible state which can be relied on to occur naturally on a regular basis
capable of supporting combustion

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