Q. Which of the following countries has introduced "direct democracy"?

Explanation:

Direct democracy is a form of democracy in which people vote on policy initiatives directly, as opposed to a representative democracy in which people vote for representatives who then vote on policy initiatives, Many countries that are representative democracies allow for three forms of political action that provide limited direct democracy: referendum (plebiscite), initiative, and recall. Referendums can include the ability to hold a binding vote on whether a given law should be rejected. This effectively grants the populace which holds suffrage a veto on a law adopted by the elected legislature (one nation to use this system is Switzerland).