4. Which statement is correct?

a - Exchange rates are adjusted each morning and held constant until the following morning.

b - The four most commonly traded currencies in the foreign exchange markets are the U.S. dollar, French franc, European euro, and Brazilian real.

c - All South American countries use the peso as their currency.

d - New Zealand uses the same currency as Australia and that is the A$.

e - The foreign exchange market is the largest financial market in the world.