If mark decides to put the tf-300 fans that his company manufactures on the market, and the fans are considered to be an unreasonably dangerous product, the party who was injured would not need to prove: the plaintiff must incur physical harm to self or property by use or consumption of the product. the defendant must normally be engaged in the business of selling or distributing that product. the defective condition must be the proximate cause of the injury or damage. the defendant must have acted with intent to cause harm.