The U.S. Golf Association put a new rule (effective January 1, 2016) that prohibits players from anchoring their putters to their chests. Tim Clark, a golfer from South Africa, who has won ten championships, anchors his putter to his chest and reacted, “We are not going to roll over and just accept this. We have been put in a position where we have to fight for our livelihoods.” Explain what source of law is involved. How can the rule be challenged? Where would the golfers go to court? (This is a Business Law question)