271. Which statement about entry into a space that has been sealed for a long time is TRUE?

The heat of the sun on upper ballast tanks, such as in a bulk carrier, may generate carbon monoxide.
You can safely enter the space without a breathing apparatus if the oxygen content exceeds 14%.
A tank that has been used to carry hazardous liquids should be tested for oxygen content, toxicity, and explosive gases.
The natural ventilation through the installed vents is sufficient to provide the proper oxygen content.

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