How many b1 or b2 fire extinguisers must motorboats 24 feet and longer have?

CLass 1 Class 2 class 3

16-26ft 26 ft-40 ft 40ft-65ft

1 B1 2 b1 or 1 b2 3 b1 or 1 b1 and 1 B2

Im taking a boating class currently