In 2012, the acute problems of Eurozone countries spilled over to the Swiss franc as Switzerland became a refuge from the euro regions worsening fiscal crisis that had seen Greece, Ireland, Spain, and latterly Italy all having to address budget deficits. The very existence of the euro was under threat. In this environment, money poured into Switzerland from the Eurozone, which threatened to push up the Swiss franc against the euro and decimate local businesses. Describe all appropriate methods the Swiss central bank must use to protect its economy.