Answer: D
Item A, from the perspective of authorization conditions, the creativity required for invention patents must have outstanding substantive features and significant progress, while the creativity required for utility model patents must be Creativity is relatively low. In item B, inventions and utility models are technical solutions, while appearance designs are only design solutions for various elements or combinations of elements in appearance. Although inventions and utility models are both technical solutions, their respective categories are different. Item C, the technical solutions involved in the invention are broader, including both methods and technical solutions for various products, while utility models do not include methods, but only include certain types of technical solutions in products, that is, changes to the shape, shape, and shape of the product. Construct or combine the proposed technical solutions. Item D, in terms of authorization procedures, inventions need to undergo preliminary examination and substantive examination before being authorized, while utility models and designs are authorized after preliminary examination.