B. a hard fiber or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

C. through slots are made at top and a cotter-pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end

D. one smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

E. none of the above