(d) In a prosecution under this section, it is not a defense that a person with whom the defendant conspires could not be guilty of the crime that is the object of the conspiracy because of
- (1) lack of criminal responsibility or other legal incapacity or exemption;
- (2) belonging to a class of persons who by definition are legally incapable in an individual capacity of committing the crime that is the object of the conspiracy;
- (3) unawareness of the criminal nature of the conduct in question or of the criminal purpose of the defendant; or
- (4) any other factor precluding the culpable mental state required for the commission of the crime.