67. As a general guide, under which condition should hygroscopic cargoes be ventilated?

When the dew point of the air in the hold is very low
When the outside dew point is 60°F (16°C) and the cargo temperature is 54°F (12°C)
When the dew point of the outside air is greater than the dew point of the air in the hold
When going from a warm to a cold climate

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