If one country determines it wants a fixed exchange rate with another a. It can do nothing

Question:

If one country determines it wants a fixed exchange rate with another

a. It can do nothing on its own, it must have the cooperation of the other country.

b. It only needs to announce its desired exchange rate, and that will result.

c. It must stand ready to purchase or sell its own currency in the market to maintain the desired exchange rate.

Exchange Rate
The value of one currency for the purpose of conversion to another. Exchange Rate means on any day, for purposes of determining the Dollar Equivalent of any currency other than Dollars, the rate at which such currency may be exchanged into Dollars...