The valid impossibility defense here would be: What the defendant plans to do to the victim is not a criminal act.
This is an act in the legal terms that talks about actions that are impossible to commit legally.
It is a defense that is said for a person that is on trial for a criminal action. The action of the defendant on the victim can not be said to be illegal.
Read more on the impossibility act here: https://brainly.com/question/7306383