pls tell the correct option. Thanks

Which of the following statements is true? (a) Most economists think that unemployment will remain close to the natural. rate of unemployment in the short run. (b) For many economists1 monetary policy's shorter outside lag is an advantage in using monetary policy for stabilization efforts. (e) Monetary policy rules have the advantage of giving the Fed discretion to deal with sudden shocks and crises. (d) All of the above are true