(2) Defense. It is a defense to a prosecution under this section that, if the criminal object were achieved, the defendant would be a victim of the offense or the offense is so defined that his conduct would be inevitably incident to its commission or he otherwise would not be guilty under the statute defining the offense or as an accomplice under section 401.
(3) Defense Precluded. It is no defense to a prosecution under this section that the person solicited could not be guilty of the offense because of lack of responsibility or culpability, or other incapacity or defense.
(4) Grading. Criminal solicitation is an offense of the class next below that of the crime solicited.
(5) Jurisdiction. There is federal jurisdiction over an offense defined in this section as prescribed in section 203.