I. A person is guilty of criminal solicitation if, with a purpose that another engage in conduct constituting a crime, he commands, solicits or requests such other person to engage in such conduct. II. It is an affirmative defense to prosecution under this section that the actor renounced his criminal purpose by persuading the other not to engage in the criminal conduct or by otherwise preventing commission of the crime under circumstances manifesting a purpose that it not occur. III. It is no defense to prosecution under this section that the person solicited would be immune from liability for engaging in the criminal conduct by virtue of irresponsibility, incapacity or exemption. IV. The penalty for criminal solicitation is the same as that authorized for the crime that was solicited, except that in the case of solicitation of murder the punishment shall be imprisonment for a term of not more than 30 years.