Answer: C
(1) Option A: Appearance design is the appearance design of a product. Appearance design must be based on the appearance of the product and constitute a combination of product and design; (2 ) Option B: Utility models and designs are subject to preliminary examination only, and no substantive examination is conducted; (3) Option C: Compulsory license for patent implementation is limited to inventions and utility models, excluding designs; (4) Option D: Invention patents The protection period for utility model patent rights and design patent rights is 20 years, and the protection period for utility model patent rights and design patent rights is 10 years, both calculated from the date of application.