Which one of the listed requirements regarding immersion suits do not correspond to present regulations? The immersion suit is made of waterproof materials and constructed such that :

A. It is provided with arrangements to reduce free air in the legs of the suit
B. It will have sufficient built in buoyancy to avoid the use of a lifejacket
C. It can be unpacked and donned without assistance within 2 minutes
D. It will cover the whole body with the exception of the face