In General, an Exchange Rate Is Defined ________

In general, an exchange rate is defined ________.

A) as the amount of one currency that can be exchanged for a unit of another currency.
B) as the amount of two currencies that can be exchanged for a unit of another currency.
C) as the amount of a Japanese yen (and no other currency) that can be exchanged for a unit of any other currency in the world.
D) as the amount of one currency (of any country) that can be exchanged for a unit of a U.S. dollar and no other currency.