Castle nut is a locking device in which__________________?

A. 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

B. a slot is cut partly is middle of nut and then slot reduced by tightening a screw

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

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

E. none of the above.

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