What are the three key features of a monetary union?

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fixed capital flows, variable exchange rates, and stable interest ratespermanently fixed exchange rates, unrestricted capital movement, and a unified interest rateshared currency, a single central banking authority, and coordinated monetary policycommon currency, flexible exchange rates, and joint monetary policynone of the above

Explanation

A monetary union is characterized by permanently fixed exchange rates, free movement of capital, and a single interest rate. Other options either describe partial aspects or incorrect features of such unions.