Any future relation still needs a withdrawal agreement, which has been rejected.
What we need is just the options for how to deal with the withdrawal agreement itself.
Option 2. Revoke Article 50
Option 3. Confirmatory referendum
And that's it, just those three. They're the only ones that deal with the withdrawal agreement itself.
1. Revoke Article 50.
2. Second referendum.
The Brexiteers won't accept revoke without at least another shot at persuading the country to leave.
So I guess it's a referendum.