Evaluate the procedural mandates required for the Central Parliament to execute territorial modifications across different administrative zones:
1. The execution of a merger or boundary alteration involving a constituent State legally demands the binding consent of all involved state legislatures.
2. The parliamentary procedure necessitates that a boundary alteration bill affecting a State must be referred to that State's assembly solely to solicit its views.
3. The parliamentary procedure necessitates that a boundary alteration bill affecting a Union Territory must be formally referred to the legislature of that Union Territory.