This question should be a multiple-choice question, and D is the rule of intellectual activities, such as chess rules and game rules. . Can you say to patent Lol's game rules? Obviously not. In addition, A seems to violate the public interest and the law and cannot set up a patent, so I think the answer is ABD.
But the answer to the final exam of Southwest University of Political Science and Law is BD.
The answer given by the general education teacher is ABD.
Lz, do it yourself