The act of buying and selling money by using the other types of money is exchanging currency.
What is Currency Exchange?
Exchange currency allows the licensed business to exchange the money in the form of cash, coins, paper bills, and other physical money from one country to another country.
Exchange of currency can be done in the banks, airports, and hotels by giving some nominal fees.
Thus, option B, currency exchanging is the act of buying and selling of money.
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