There Are Several Types of Countertrade Transactions

There are several types of countertrade transactions:

A) none of which involve the use of money.
B) in each type, the seller provides the buyer with goods or services in return for a reciprocal promise from the seller to purchase goods or services from the buyer.
C) in each type, the seller provides the buyer with goods or services in return for a reciprocal promise from the buyer to stand ready to sell goods or services to the buyer.
D) none of the above