Who makes up the Commonwealth of Nations?

1) former British colonies as required by the monarch

2) Great Britain and other countries who are allies

3) former British colonies who voluntary join

4) nations that use the same kind of money

The Commonwealth of Nations is primarily made up of former British colonies who have voluntarily joined, as well as Great Britain and certain other countries who are allies or have historical ties to the British Empire. The requirement for membership is not based on the use of the same currency.