Answer: C
The knowledge point tested in this question is the period of relief for invalidation of patent rights. 1. According to Article 46 of the Patent Law, if you are dissatisfied with the decision of the Patent Reexamination Board to declare the patent right invalid or maintain the patent right, you may file a lawsuit in the People's Court within three months from the date of receipt of the notice. The people's court shall notify the other party in the invalidation request procedure to participate in the litigation as a third party. Therefore, the correct answer is c.