The challenge says, "Is there any way you can prevent a lead from being created if the lead isn’t located in a US state?" This challenge is super easy to pass if I just hardcode the US states in the validation rules. Some people say they passed by just preventing any non-2-character state. But for curiosity's sake, I want to know if there's a way to avoid hardcoding each state in the validation rule. I tried using Custom Metadata Types (Country and State) with a Metadata Relationship (State/s as the child/ren of a Country) but it seems impossible to reference in a formula field. Please help me know if there's any way Metadata Types would work in this scenario or if there's a different approach to this.
