There are three types of money: commodity money, commodity-backed money, and fiat money. What type of money is used in each of the following

There are three types of money: commodity money, commodity-backed money, and fiat money. What type of money is used in each of the following situations?

A. Bottles of rum were used to pay for goods in colonial Australia?

B. Salt was used in many European countries as a medium of exchangee?

C. For a brief time, Germany used paper money (the "Rye Mark") that could be redeemed for a certain amount of rye, a type of grain?

D. The tow of Ithaca, New York, prints its own currency, the Ithaca HOURS, which can be used to purchase local goods and services?