The ideal international currency regime is characterized by three key properties. One of these is full convertibility of currencies, meaning they can be freely exchanged for any purpose and in any amount, ensuring unrestricted capital flows. This aligns with the principles of economic efficiency and global trade facilitation.

• Option B is incorrect because the ideal regime requires credibly fixed exchange rates, not floating rates, to minimize volatility.
• Option C is incorrect as the regime allows for independent monetary policies by each country to address domestic objectives like growth and inflation, rather than a common policy.