100. How is the external flotation bladder of an immersion suit inflated?

It is inflated by blowing through an inflation tube.
It inflates by sea water bleeding into the flotation bladder and reacting with a chemical therein.
It is inflated by a small CO2 bottle that is automatically tripped when the front zipper is at the top of the zipper track.
It is inflated by a small CO2 bottle that is manually tripped.

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