With Regard to the Legal Defence "Not Criminally Responsible on Account

With regard to the legal defence "not criminally responsible on account of mental disorder," which statement best describes the use and success of this defence,according to Lumburner and Roesch

A)  It is rarely used, but often successful when it is employed. 
B)  It is rarely successful and used only in cases of severely disordered defendants. 
C)  It is often used but rarely successful. 
D)  It is typically misused in most cases and is unsuccessful.