The correct answer is option 2, referendum. A referendum is a process in which the public is asked to vote on a proposed law or policy. It is a direct form of democracy that allows citizens to express their opinion on a specific issue. In a referendum, the public is given the opportunity to vote either in favor of or against a particular bill. This helps in eliciting public opinion and determining whether the bill should be enacted into law or not.

Option 1, plebiscite, refers to a vote where the public is asked to decide on an important national or political issue. Option 3, recall, is a process to remove an elected official from office before their term ends. Option 4, initiative, is a procedure that allows citizens to propose new laws or changes to existing laws through a petition. Alert - correct answer should be option 2.