The difference between an invention patent and a utility model patent is ().

A、Inventionmustbetheproposalandinnovationofnewmethods
B、Theutilitymodelmustbeaproductwithshapeandstructure
C、Thecreativerequirementsofutilitymodelpatentsarelowerthaninventionpatents
D、Someproductscannotdeclareutilitymodelpatents