What Was the Major Change Contained in the Insanity Defense

What was the major change contained in the Insanity Defense Reform Act?

A) The defense was required to prove insanity on the part of the defendant.
B) The prosecution was now required to prove the defendant was not insane.
C) The court took on the task of proving whether a mental illness existed or not.
D) The definition of insanity was left up to the individual states.