A problem facing the timber industry is the absence of an effective way to prove that rainforest timber was legally harvested. Companies like Home Depot do not want to sell timber from illegally logged forests. If a supplier is trying to sell illegally acquired logs to Home Depot, which condition of exchange would Home Depot be concerned about?

a$.$ There are more than two parties involved.

b$.$ Each party has something of value to bring to the exchange

c$.$ One party is free to accept the exchange offer.

d$.$ Each party believes it is appropriate to deal with the other party$-$