In which situation does Seller make an express warranty?

a. during negotiation, seller gave byron a brochure regarding a ring that byron was considering purchasing. The brochure stated that the ring was sterling silver.

b. During negotiations for the sale of a drill. Seller stated to Buyer. "This drill is the best little drill on the market today. " Seller did not say anything else.

c. During the negotiations for the sale of a chair to be specifically manufactured. Seller showed Buyer a model of what the chair would be like. Seller did not say or do anything else.

d. a. and c.