As Opposed to a Mistake of Law, a Mistake of Fact

As opposed to a mistake of law, a mistake of fact operates as a defense if:

A) the accused relies on an official statement of the law that is erroneous.
B) the law is not published or reasonably known to the public.
C) it negates the mental state necessary to commit a crime.
D) it is caused by the neglect of a legal duty on the part of the accused.