4, An implied warranty of merchantability applies in which of the following transactions?

a. The sale of a new riding mower by a retail seller of lawn and tractor equipment

b. The sale of a used riding mower at a neighborhood yard sale

c. The sale of a used riding mower by Frank, a college professor, to his neighbor

d. The sale of a never-ridden riding mower by the widow of the original purchaser

5, In the past six months, Supplier has made late deliveries to many customers and a good portion of the goods delivered have been defective. Buyer is worried that an important scheduled delivery will be late or nonconforming. He sends a written request to Supplier asking for confirmation that the contract terms will be met. When Buyer purchases these goods from another seller after Supplier repudiates the contract, Buyer has exercised his right of

a. cover

b. cure

c. replevin

d. commercial protection