Which statement about immersion suits is TRUE?

The suit must, without assistance, turn an unconscious person's mouth clear of the water within 5 seconds.

The suit is flameproof and provides protection to the wearer while swimming through burning oil.

The suit's oil resistance is such that it will be serviceable and be usable after exposure to gasoline or mineral spirits without needing to be specially treated.

The suit seals in body heat and provides protection against hypothermia indefinitely.

Which statement about immersion suits is...