I voted for Option #1. Your eligibility to join any team should be based on what you can do, not on how you acquired the ability to do it.
Mutants being on non x-teams OK/ non mutants being on x-teams OK
Mutants being on non x-teams OK/ non mutants being on x-teams NOT OK
Mutants being on non x-teams NOT OK/ non mutants being on x-teams OK
Mutants being on non x-teams NOT OK/ non mutants being on x-teams NOT OK
I voted for Option #1. Your eligibility to join any team should be based on what you can do, not on how you acquired the ability to do it.
Beverly Allen, the Bee--with honey and stinger.
"If humans have souls, then clones will have them, too."--Arthur Caplan