Mark is an artist who creates abstract sculptural works.He works with a mechanical engineer to convert his abstract works into a line of functional lamps for sale through his online store on ebay.If Mark files a design patent to protect his lamps, which of the following would be true?

a.the design patent would only protect the novel and nonobvious functional parts of the lamp

b.his ownership of the design would be incontestable five years after registration

c.the design patent would only protect the novel and nonobvious ornamental parts of the lamp

d.the design patent would protect his lamps for his lifetime plus 70 years after his death