Farm Equip, Inc., makes farm$$ing machinery. Gail discovers that her Farm Equip tractor is defective and sues the maker for product liability based on negligence. To win, Gail must show that

Farm Equip sold the tractor to Gail.

Gail knew and appreciated the risk caused by the defect.

Gail suffered an injury caused by the defect.

the $$defect$$ was a commonly known danger.