4. Assume the following information: A. What USD-denominated percent rate of return can a US investor earn if they attempt covered interest arbitrage? (to two decimal places like 6.54\%) B. What AUD-denominated percent rate of return can an Australian investor earn if they attempt covered interest arbitrage? (to two decimal places like 6.54% ) C. Given this information, who has a covered interest arbitrage opportunity? Answer either "Australian investors" or "U.S. investors". D. What changes in the 4 quoted prices above would likely occur to eliminate any further possibilities of covered interest arbitrage? (answer with just or t ) Spot rate of U.S. dollar 180-day forward rate of U.S. dollar