The spot exchange rate between US Dollar and Euro is a floating (flexible), which of the following are true about the exchange rate between these two currencies? O An increase in demand for US product by European citizens, will result in appreciation of US dollar against Euro. An increase in demand for US product by European citizen will result in depreciation of US dollar against Euro. O A decrease in demand for US product by European citizen will result in depreciation of US dollar against Euro. An increase in demand for European product by US citizen will result in depreciation of Euro against US dollar O Both a and c. O Both b and d