Quantitative easing (QE) is a monetary policy tool used by central banks to stimulate the economy when standard monetary policy becomes ineffective. The process generally involves the purchase of longer-term securities from the open market to increase the money supply and encourage lending and investment. In the last decade, several countries have adopted QE as a strategy to counter economic stagnation or recover from financial crises. Notable among these countries are:
Given these facts, the correct option is: All of the above, as all three countries have utilized quantitative easing in the last decade.