Which of the following represents a demonstration of acceptance of goods by a buyer? (Choose all that apply.)

a. The buyer or lessee indicates (by words or conduct) to the seller or lessor that the goods are conforming or that he or she will retain them in spite of their nonconformity.

b. The buyer or lessee fails to reject the goods within a reasonable period of time.

c. The buyer performs any act inconsistent with the seller's ownership of the goods.

d. None of these.